{ "title": "Ghost Bezel Complications Atlas", "reviewed_on": "2026-10-06", "expanded_on": "2026-10-07", "version": 2, "scope": "Documented traditional watch functions, named variants, scales, tools and related mechanisms. Mechanical and electronic equivalents are grouped. This is not a claim to exhaust every historical invention, proprietary variant or smartwatch software function.", "method": "Prefer museum object records, patents and original manufacturer publications. Original invention, surviving example and maker milestone are different claims. Unestablished origins remain explicit.", "entries": [ { "id": "annual-calendar", "title": "Annual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Quantième annuel" ], "purpose": "Reduces calendar adjustment by recognising months containing 30 or 31 days.", "mechanism": "Patek's documented mechanism advances correctly through those month lengths but requires manual correction at the end of February.", "history": { "date": "1996", "who": "Patek Philippe", "account": "Patek states that it invented and patented its Annual Calendar and introduced it in 1996. The cited overview does not identify an individual inventor.", "status": "Maker milestone" }, "fact": "An annual calendar still needs its February correction in a leap year.", "sources": [ { "title": "Patek Philippe: Calendar Watches", "url": "https://www.patek.com/en/manufacture/quality-and-fine-workmanship/calendar-watches", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The calendar that leaves you one appointment", "account": "Most calendar watches ask their owners to help at the end of short months. Patek Philippe's 1996 Annual Calendar took over the distinction between thirty and thirty-one days, leaving February for the wearer. Its appeal is a practical compromise: more mechanical memory than a simple date, without a perpetual calendar's leap-year program.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "big-date", "title": "Big date / outsize date", "family": "Calendars", "kind": "Display variant", "aliases": [ "Large date", "Grande date", "Panorama date" ], "purpose": "Enlarges the date numerals for easier reading. Different manufacturers achieve the enlarged display with different constructions.", "mechanism": "Lange's documented implementation separates a units disc from a tens cross. This account describes the Lange mechanism rather than every big-date construction.", "history": { "date": "1994", "who": "A. Lange & Söhne", "account": "Walter Lange presented the Lange 1 on 24 October 1994; its outsize date was inspired by Dresden's opera-house clock.", "status": "Maker milestone" }, "fact": "The inspiring five-minute clock, created by Johann Christian Friedrich Gutkaes, was unveiled in 1841.", "sources": [ { "title": "A. Lange & Söhne: Outsize Date", "url": "https://www.alange-soehne.com/th-en/timepieces/selections/outsize-date", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "A. Lange & Söhne: Five-minute clock history", "url": "https://press.alange-soehne.com/the-time-in-five-minute-increments/", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "An opera house, shrunk to the wrist", "account": "The Lange 1's outsize date has an ancestor above an opera stage. Johann Christian Friedrich Gutkaes created Dresden's five-minute clock in 1841; its framed numerals later inspired the watch presented by Walter Lange in 1994. The date's separated digits make a small everyday piece of information feel architectural.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "chinese-perpetual-calendar", "title": "Chinese perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Programmed Chinese lunisolar calendar" ], "purpose": "Programs Chinese lunisolar-calendar information over a specified long interval despite the system's irregular calendar cycle.", "mechanism": "Vacheron states that its Calibre 3752 mechanically programs the Chinese calendar through 2200. The overview does not disclose a complete calendar gearing diagram.", "history": { "date": "2024", "who": "Vacheron Constantin", "account": "The Berkley Grand Complication introduced this documented implementation in 2024.", "status": "Maker milestone" }, "fact": "The stated programming horizon is 2200: the word perpetual should not be read as an unlimited guarantee.", "sources": [ { "title": "Vacheron Constantin: Berkley Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/berkley-grand-complication.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Programming a calendar that will not repeat neatly", "account": "A Chinese lunisolar calendar presents a different challenge from the familiar four-year leap cycle. Vacheron Constantin's 2024 Berkley Grand Complication carries a mechanical program through 2200. That stated horizon is part of the story: even an extraordinary calendar has a defined range, rather than an unlimited promise hidden inside its name.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "complete-calendar", "title": "Complete / triple calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Triple date", "Quantième complet" ], "purpose": "Shows weekday, date and month together. A complete calendar should not be confused with automatic recognition of unequal month lengths.", "mechanism": "Blancpain describes day and month windows with a date hand; its complete calendar needs correction after months shorter than 31 days.", "history": { "date": "1983", "who": "Blancpain", "account": "Blancpain's 1983 moon-phase watch combined those calendar displays. This is a documented brand example; the original complete-calendar inventor is unresolved.", "status": "Maker milestone" }, "fact": "While running, a conventional complete calendar requires five short-month corrections each year.", "sources": [ { "title": "Blancpain: Complications", "url": "https://www.blancpain.com/fr/technique-horlogere/complications-blancpain", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Blancpain: The Phase of the Moon", "url": "https://lettresdubrassus.blancpain.com/en/issue-16/phase", "supports": [ "history", "story" ] } ], "story": { "heading": "A miniature almanac with a human editor", "account": "Day, date and month make a watch look wonderfully self-sufficient. Yet a conventional complete calendar still needs help after short months. Blancpain's documented 1983 example paired these indications with a moon phase, bringing a calendar and a small view of the heavens together on one dial.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "easter-date", "title": "Date of Easter", "family": "Calendars", "kind": "Complication", "aliases": [ "Computus indication", "Easter calendar" ], "purpose": "Displays Easter's annually changing calendar date.", "mechanism": "Patek documents a dedicated patented Easter-date mechanism in Calibre 89; the overview does not establish an unlimited computation range.", "history": { "date": "1989", "who": "Patek Philippe", "account": "Calibre 89 was introduced for the manufacture's 150th anniversary in 1989. This establishes the watch example rather than the origin of Easter clocks.", "status": "Maker milestone" }, "fact": "An Easter-date indication is a separate calendar function from an ordinary moon-phase image.", "sources": [ { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Patek Philippe Museum: 20-year anniversary", "url": "https://static.patek.com/pdf/pressreleases/en/2021_PatekPhilippe_Museum_20years.pdf", "supports": [ "history", "story" ] } ], "story": { "heading": "A date that refuses to stay put", "account": "An ordinary calendar can repeat a fixed appointment. Easter asks for a changing date. Patek Philippe included a dedicated patented Easter-date mechanism in its 1989 Calibre 89 anniversary watch. A moon-phase picture alone cannot do this job: the date requires a calendar mechanism of its own.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "day-date", "title": "Day-date", "family": "Calendars", "kind": "Complication", "aliases": [ "Weekday and date", "Jour-date" ], "purpose": "Combines the weekday with the numbered date, so both parts of an everyday calendar reference can be read together.", "mechanism": "Rolex's documented Day-Date uses disc mechanisms for both indications; its day and date switch simultaneously and instantaneously.", "history": { "date": "1956", "who": "Rolex", "account": "Rolex introduced the Day-Date in 1956 with the weekday spelled out in full in a window. This narrowly scoped milestone is not the origin of all weekday displays.", "status": "Maker milestone" }, "fact": "Rolex's current documentation offers the written weekday in 26 languages.", "sources": [ { "title": "Rolex Newsroom: Day-Date", "url": "https://newsroom.rolex.com/watches/oyster-collection/day-date", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The weekday gets a voice", "account": "A date numeral answers only part of the everyday question. Rolex's 1956 Day-Date spelled the weekday out in a window, making the dial read more like a sentence. The manufacturer's language options give this familiar complication another dimension: the same mechanism can speak to its wearer through different written weekdays.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "four-digit-year", "title": "Four-digit year indication", "family": "Calendars", "kind": "Display variant", "aliases": [ "Year display" ], "purpose": "Shows the year directly rather than requiring the wearer to infer it from a leap-year-cycle marker.", "mechanism": "IWC's documented Da Vinci mechanism synchronises calendar information so its displays can be advanced through the crown.", "history": { "date": "1985", "who": "Kurt Klaus / IWC", "account": "Klaus's perpetual-calendar module debuted in the 1985 Da Vinci. IWC identifies the four-digit year display as a novel feature of that design.", "status": "Maker milestone" }, "fact": "The calendar module contained 82 individual components and was combined with a chronograph.", "sources": [ { "title": "IWC: Time Machines", "url": "https://press.iwc.com/time-machines-en/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A watch with room for the century", "account": "In IWC's 1985 Da Vinci, Kurt Klaus's perpetual-calendar module made the year itself visible in four digits. Its eighty-two components worked alongside a chronograph. The display turns a usually hidden calendar state into something readable, inviting the owner to think beyond the next day or month.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "hebrew-calendar", "title": "Hebrew perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Hebraic calendar", "Judaic calendar" ], "purpose": "Coordinates the Hebrew calendar's lunar months and solar-year alignment.", "mechanism": "Vacheron's mechanism uses a 19-year Metonic cycle and incorporates inserted months. This is the maker's documented construction rather than a universal gearing description.", "history": { "date": "2015", "who": "Vacheron Constantin", "account": "Reference 57260, presented in 2015, supplies the documented watch example. Its calendar overview does not establish every preceding attempt or inventor.", "status": "Maker milestone" }, "fact": "The watch also displays the date of Yom Kippur in Gregorian terms alongside the Hebrew year.", "sources": [ { "title": "Vacheron Constantin: Reference 57260", "url": "https://www.vacheron-constantin.com/sa/en/watches/exceptional-timepieces/reference-57260.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Giving two calendars a shared home", "account": "Vacheron Constantin's Reference 57260 brings the Hebrew calendar's nineteen-year cycle and inserted months into a mechanical watch. Its Yom Kippur indication also translates that observance into a Gregorian date. The interesting achievement is the coordination of different calendar systems, rather than simply adding another numbered window.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "leap-year-indicator", "title": "Leap-year-cycle indication", "family": "Calendars", "kind": "Display variant", "aliases": [ "Leap-year display", "Four-year-cycle indicator" ], "purpose": "Shows the current position in a perpetual calendar's four-year cycle.", "mechanism": "Patek documents a hand-based indication on Ref. 5740 and a leap-year-cycle display in the instantaneous Grandmaster Chime calendar.", "history": { "date": "Not established", "who": "Patek Philippe", "account": "These are documented examples; the overview does not establish the indication's original inventor.", "status": "Origin unresolved" }, "fact": "The indication displays a calendar state; it is not itself a different calendar algorithm.", "sources": [ { "title": "Patek Philippe: Calendar Watches", "url": "https://www.patek.com/en/manufacture/quality-and-fine-workmanship/calendar-watches", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "fact", "story" ] } ], "story": { "heading": "A small window into the calendar's memory", "account": "A perpetual calendar has to know where it stands in the leap-year cycle. The leap-year indication lets its owner see that hidden state. It may look like a minor addition beside the date and month, but it explains why the mechanism treats one February differently from the others.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "perpetual-calendar", "title": "Perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Quantième perpétuel", "Gregorian perpetual calendar" ], "purpose": "Recognises unequal month lengths and the usual four-year leap-year cycle.", "mechanism": "The programmed calendar adds February 29 in leap years. Conventional versions do not automatically handle all Gregorian century exceptions.", "history": { "date": "1925", "who": "Patek Philippe", "account": "Patek documents a perpetual-calendar wristwatch made in 1925 from an 1898 movement. This is a wristwatch milestone, not invention of the whole complication.", "status": "Maker milestone" }, "fact": "A conventional perpetual calendar needs correction in 2100, which is not a Gregorian leap year.", "sources": [ { "title": "Patek Philippe: Calendar Watches", "url": "https://www.patek.com/en/manufacture/quality-and-fine-workmanship/calendar-watches", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "fact", "story" ] } ], "story": { "heading": "Mechanical memory meets a stubborn February", "account": "Patek Philippe's documented 1925 perpetual-calendar wristwatch used a movement made in 1898, connecting a wristwatch milestone to an earlier mechanism. The function remembers unequal months and leap years. Its name still has a boundary: a conventional four-year program needs help in 2100, when the Gregorian calendar skips the expected leap day.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "pointer-date", "title": "Pointer date", "family": "Calendars", "kind": "Display variant", "aliases": [ "Date hand", "Pointer calendar" ], "purpose": "Shows the date with a hand that points to a numbered scale, keeping the calendar legible without a date aperture.", "mechanism": "Oris documents a central pointer hand indicating the date on its historical pilot's watch. The hand supplies calendar information alongside the ordinary time display.", "history": { "date": "1938", "who": "Oris", "account": "Oris identifies 1938 as the year of its first pilot's watch, which included a central date hand. The broader variant's origin is not established here.", "status": "Maker milestone" }, "fact": "The same historical Oris watch used an oversized crown and large Arabic numerals, features intended for aviation use.", "sources": [ { "title": "Oris Help Center: Aviation watch history", "url": "https://helpcenter.oris.ch/hc/en-gb/articles/16999130976273-What-makes-an-Oris-aviation-watch-an-aviation-watch", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The calendar becomes a hand", "account": "Oris's 1938 pilot's watch combined a central date pointer with an oversized crown and large numerals. Instead of hiding the calendar in a small window, it placed the date around the dial. This is a story about presentation: the hand and the aperture can carry the same information with very different personalities.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "retrograde-date", "title": "Retrograde date", "family": "Calendars", "kind": "Display variant", "aliases": [ "Returning date hand" ], "purpose": "Shows the date along an arc instead of a complete circular track, giving calendar information a distinctive layout.", "mechanism": "Vacheron describes a date hand moving through an arc, then snapping back to its starting point before beginning another cycle.", "history": { "date": "1940", "who": "Vacheron Constantin", "account": "The maison's archives identify 1940 as its first wristwatch retrograde date. This establishes Vacheron's milestone, not the universal invention of retrograde calendars.", "status": "Maker milestone" }, "fact": "The current Traditionnelle Openface range exposes a retrograde calendar mechanism through an openworked dial.", "sources": [ { "title": "Vacheron Constantin: Traditionnelle Openface", "url": "https://www.vacheron-constantin.com/sa/en/watches/novelties/traditionnelle-openface-dials.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The end of the month becomes a performance", "account": "A retrograde date follows an arc instead of continuing around a full circle. When its cycle finishes, the pointer returns to the beginning. Vacheron Constantin's archives record its first wristwatch example in 1940. That visible return gives an otherwise ordinary calendar change a moment of mechanical theatre.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "retrograde-perpetual-calendar", "title": "Retrograde perpetual calendar", "family": "Calendars", "kind": "Display variant", "aliases": [ "Jumping retrograde perpetual calendar" ], "purpose": "Combines a perpetual-calendar calculation with a returning calendar display. It is a display variant of the calendar family rather than a separate calendar system.", "mechanism": "Vacheron's Le Temps Céleste is described as a retrograde jumping perpetual calendar. The cited overview establishes that combination but does not disclose a complete gearing diagram.", "history": { "date": "2021", "who": "Vacheron Constantin", "account": "Le Temps Céleste was presented at Watches & Wonders 2021. This is a documented implementation, not an established invention date.", "status": "Maker milestone" }, "fact": "The same watch includes three-dimensional hemispheres for 24-hour and day/night information.", "sources": [ { "title": "Vacheron Constantin: Le Temps Céleste", "url": "https://www.vacheron-constantin.com/us/en/watches/cabinotiers/temps-celeste.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Long memory, dramatic delivery", "account": "Bovet's Le Temps Céleste, presented in 2021, combines perpetual-calendar information with a retrograde display and three-dimensional hemispheres. The calendar logic and the moving presentation are separate achievements. Together they make a useful distinction tangible: what a watch knows and how it chooses to show it are different design questions.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "secular-calendar", "title": "Secular perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Centennial calendar", "Century calendar", "Eternal calendar" ], "purpose": "Extends leap-year logic to the Gregorian calendar's century exceptions.", "mechanism": "IWC's 2024 implementation uses a 400-year wheel with three indentations to suppress three leap days.", "history": { "date": "1989; 2024", "who": "Patek Philippe; IWC", "account": "Calibre 89 is a documented earlier example; IWC introduced its own Eternal Calendar in 2024.", "status": "Maker milestone" }, "fact": "Under the Gregorian rules, 2100, 2200 and 2300 are ordinary years, while 2400 is a leap year.", "sources": [ { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "purpose", "history", "story" ] }, { "title": "Patek Philippe Museum: 20-year anniversary", "url": "https://static.patek.com/pdf/pressreleases/en/2021_PatekPhilippe_Museum_20years.pdf", "supports": [ "history", "story" ] }, { "title": "IWC: Portugieser Eternal Calendar, 9 April 2024", "url": "https://press.iwc.com/iwc-portugieser-eternal-calendar-45-million-years-moon-phase-accuracy-en/", "supports": [ "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The calendar that remembers the exception to the exception", "account": "A four-year leap cycle works for a long time, until a century year changes the rule. Secular calendars go further: 2100, 2200 and 2300 are ordinary years, while 2400 is a leap year. Examples such as Calibre 89 and IWC's Eternal Calendar tackle this longer pattern rather than merely extending the ordinary perpetual-calendar display.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "semi-perpetual-calendar", "title": "Semi-perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Four-year calendar", "1461-day calendar" ], "purpose": "Handles ordinary calendar variation with less frequent correction than an annual calendar, while leaving the leap-year adjustment to the wearer.", "mechanism": "Breitling explicitly identifies its Calibre 19 mechanism as semi-perpetual and says it needs adjustment once each leap year. The source establishes this model's behaviour rather than a universal construction.", "history": { "date": "Not established", "who": "Breitling", "account": "The Super Chronomat Four-Year Calendar is a documented implementation. The cited manufacturer page does not establish the original inventor or invention date.", "status": "Documented example" }, "fact": "Its name references the 1,461-day interval between required adjustments.", "sources": [ { "title": "Breitling: Super Chronomat Four-Year Calendar", "url": "https://www.breitling.com/us-en/watches/chronomat/super-chronomat-44-four-year-calendar/U19320161C1U1/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Four years between calendar chores", "account": "Breitling's Super Chronomat Four-Year Calendar illustrates the space between annual and perpetual calendars. Its documented adjustment interval is 1,461 days. The distinction matters more than the impressive name: this mechanism reduces interventions substantially, but does not make the same promise as a calendar that automatically handles every leap-year February.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "simple-date", "title": "Simple date", "family": "Calendars", "kind": "Complication", "aliases": [ "Date window", "Aperture date", "Quantième simple" ], "purpose": "Shows the numbered day of the month, making an everyday calendar reference available on the wrist.", "mechanism": "In the documented Datejust example, the date appears through an aperture at three o'clock. This is a display of calendar information, rather than a perpetual-calendar promise.", "history": { "date": "1945", "who": "Rolex", "account": "Rolex introduced the Datejust in 1945. This documents a particular implementation; it does not establish the inventor of date displays.", "status": "Maker milestone" }, "fact": "A window date and a pointer date convey the same calendar information through different displays.", "sources": [ { "title": "Rolex: Datejust", "url": "https://www.rolex.com/watches/datejust", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "Patek Philippe: Calendar Watches", "url": "https://www.patek.com/en/manufacture/quality-and-fine-workmanship/calendar-watches", "supports": [ "fact", "story" ] } ], "story": { "heading": "The modest complication you use every day", "account": "Rolex's 1945 Datejust is a documented milestone in the history of the date window, not the invention of every date display. Its everyday usefulness helps explain why a complication need not look exotic. A small numeral adds calendar information to a watch whose basic job is telling the time.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "hijri-calendar", "title": "Tabular Islamic perpetual calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Hijri calendar", "Islamic lunar calendar" ], "purpose": "Represents the arithmetic tabular Islamic calendar, distinct from a Gregorian or Chinese calendar.", "mechanism": "Parmigiani programs a 30-year cycle with 29- and 30-day months. Nineteen years contain 354 days and eleven contain 355.", "history": { "date": "2020", "who": "Parmigiani Fleurier", "account": "The Hijri Perpetual Calendar received the GPHG Innovation Prize in 2020. This establishes an award-era example rather than the earliest Islamic calendar watch.", "status": "Maker milestone" }, "fact": "Ramadan, the ninth month, is highlighted on this model's month display.", "sources": [ { "title": "Parmigiani Fleurier: Tonda PF Hijri Perpetual Calendar", "url": "https://www.parmigiani.com/en/watches/tonda-pf-hijri/", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "GPHG: Hijri Perpetual Calendar, Innovation Prize 2020", "url": "https://www.gphg.org/en/videos/hijri-perpetual-calendar", "supports": [ "history", "story" ] } ], "story": { "heading": "A different rhythm for the year", "account": "Parmigiani Fleurier's tabular Hijri calendar follows a thirty-year arithmetic cycle, with nineteen 354-day years and eleven 355-day years. Ramadan is highlighted on the month display. Its story is about respecting another calendar's structure; this programmed system should not be confused with a mechanism that observes the Moon to declare local religious dates.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "chinese-calendar", "title": "Traditional Chinese calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Lunisolar Chinese calendar", "Xiali calendar" ], "purpose": "Combines lunar months with solar-related calendar information, including leap months and the traditional year cycle.", "mechanism": "Blancpain's implementation shows double hours, days, months, leap months, zodiac animals, five elements and ten heavenly stems.", "history": { "date": "2012", "who": "Blancpain", "account": "Blancpain introduced its Traditional Chinese Calendar wristwatch in 2012. This documents the maker's specific wristwatch milestone.", "status": "Maker milestone" }, "fact": "Ten heavenly stems paired with twelve earthly branches produce a 60-year sexagenary cycle.", "sources": [ { "title": "Blancpain: Traditional Chinese Calendar", "url": "https://www.blancpain.com/en-us/villeret/villeret-calendrier-chinois-traditionnel-0888-3631-55b", "supports": [ "history", "story" ] }, { "title": "Blancpain: Traditional Chinese Calendar, Metal Ox", "url": "https://www.blancpain.com/en/news/traditional-chinese-calendar-exceptional-timepiece-bearing-effigy-ox", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "A dial that carries a cultural calendar", "account": "Blancpain's Traditional Chinese Calendar, introduced in 2012, brings double hours, leap months, zodiac animals, elements and heavenly stems onto the wrist. The paired cycles generate a sixty-year sequence. Reading this watch means encountering a system of time with its own vocabulary, rather than a Gregorian calendar decorated with zodiac imagery.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "week-number", "title": "Week-of-year calendar", "family": "Calendars", "kind": "Complication", "aliases": [ "Weekly calendar", "Semainier", "Week number" ], "purpose": "Shows the current numbered week for planning and scheduling, alongside other calendar information.", "mechanism": "Patek's 5212 uses a semi-integrated weekly-calendar mechanism. Blancpain's Semainier uses an additional hand and a numbered outer scale.", "history": { "date": "2019", "who": "Patek Philippe", "account": "The 5212 introduced a weekly calendar to Patek's own collection in 2019. Earlier watches also showed week numbers; this is not a universal first.", "status": "Maker milestone" }, "fact": "Blancpain's Semainier dial accommodates 53 weeks rather than assuming every year has only 52.", "sources": [ { "title": "Patek Philippe: Weekly Calendar, Baselworld 2019", "url": "https://static.patek.com/pdf/pressreleases/en/2019_PatekPhilippe_Calatrava_Weekly_Calendar_Ref_5212A.pdf", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "Blancpain: New Calendars", "url": "https://lettresdubrassus.blancpain.com/en/issue-18/new", "supports": [ "mechanism", "fact", "story" ] } ], "story": { "heading": "When the useful date is a week", "account": "A meeting schedule or production plan may be organized by weeks instead of numbered days. Patek Philippe brought a weekly calendar into its collection in 2019. Blancpain's Semainier makes another important detail visible: its scale accommodates fifty-three weeks. A calendar year does not always fit into fifty-two identical numbered slots.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "moon-age", "title": "Age of the Moon", "family": "Astronomy", "kind": "Complication", "aliases": [ "Lunar age" ], "purpose": "Numerically follows progress through the Moon's cycle, as a separate indication from an image of lunar phase.", "mechanism": "Casio documents an electronic lookup of Moon age for a selected date. Vacheron's Berkley also explicitly includes a mechanical Moon-age indication; its overview does not detail the gearing.", "history": { "date": "2024", "who": "Vacheron Constantin", "account": "The Berkley Grand Complication provides a documented modern example, not the original invention of lunar-age displays.", "status": "Maker milestone" }, "fact": "Casio allows the user to inspect Moon age for a specified date rather than only the present day.", "sources": [ { "title": "Casio: Tide level and Moon age for a specified date", "url": "https://support.casio.com/global/en/wat/manual/3559_en/GUPOSYwpdjdrro.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Berkley Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/berkley-grand-complication.html", "supports": [ "mechanism", "history", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Turning moonlight into a number", "account": "A moon-phase image shows appearance; lunar age gives progress through the cycle numerically. The Berkley Grand Complication supplies a documented mechanical example, while Casio's electronic implementation can inspect a chosen date. These different constructions share an idea: make the Moon's cycle something the wearer can read as information.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "dual-hemisphere-moon", "title": "Dual-hemisphere moon phase", "family": "Astronomy", "kind": "Display variant", "aliases": [ "Double moon", "Northern and southern moon phase" ], "purpose": "Presents lunar information for both northern and southern hemispheres within the same watch.", "mechanism": "Parmigiani documents a blue aventurine moon-phase subdial showing both hemispheres. This source establishes the display, but does not reveal its complete gear ratios.", "history": { "date": "Not established", "who": "Parmigiani Fleurier", "account": "The Tonda PF Hijri Perpetual Calendar is a documented example. The original inventor and introduction date of dual-hemisphere moon displays are not established here.", "status": "Documented example" }, "fact": "This display accompanies a tabular Islamic calendar rather than replacing the calendar calculation.", "sources": [ { "title": "Parmigiani Fleurier: Tonda PF Hijri Perpetual Calendar", "url": "https://www.parmigiani.com/en/watches/tonda-pf-hijri/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "One Moon, two points of view", "account": "A dual-hemisphere display acknowledges that a lunar picture has a viewing orientation. Parmigiani's Tonda PF Hijri combines that presentation with its tabular calendar. The two functions remain distinct: depicting the Moon for different hemispheres does not itself perform the arithmetic of the calendar beside it.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "equation-of-time", "title": "Equation of time", "family": "Astronomy", "kind": "Complication", "aliases": [ "Solar-time difference" ], "purpose": "Indicates the seasonal difference between mean solar time and apparent solar time.", "mechanism": "An annual equation cam can encode the changing difference. The cited patent documents this mechanical principle.", "history": { "date": "1752", "who": "Thomas Mudge", "account": "British Museum correspondence documents Mudge making equation-of-time watches in 1752. It does not establish him as the original inventor.", "status": "Documented example" }, "fact": "A solar-time indication and ordinary civil-time indication can legitimately show different values.", "sources": [ { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "purpose", "fact", "story" ] }, { "title": "US20030031093A1: Running equation of time", "url": "https://patents.google.com/patent/US20030031093A1/en", "supports": [ "mechanism", "story" ] }, { "title": "British Museum: Thomas Mudge watch and correspondence", "url": "https://www.britishmuseum.org/collection/object/H_1984-0301-1", "supports": [ "history", "story" ] } ], "story": { "heading": "When the Sun disagrees with the clock", "account": "A sundial's apparent solar time and a watch's mean solar time do not stay perfectly aligned through the year. British Museum correspondence records Thomas Mudge making equation-of-time watches in 1752. The complication gives that disagreement a place on the dial, turning an apparent error into astronomical information.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "lunar-orbit", "title": "Lunar orbit indication", "family": "Astronomy", "kind": "Complication", "aliases": [ "Angular position of the Moon" ], "purpose": "Represents the Moon's position within an astronomical display, separately from its changing illumination phase.", "mechanism": "Patek's Celestial combines a moving sky chart with separate information about the Moon's apparent position and phases. The product overview confirms the functions rather than supplying their complete gear ratios.", "history": { "date": "Not established", "who": "Patek Philippe", "account": "Celestial Ref. 6102P is a documented implementation. The cited page does not identify the first watchmaker to display lunar orbit.", "status": "Documented example" }, "fact": "An orbit indication answers a different question from a moon-phase image, even when both share one dial.", "sources": [ { "title": "Patek Philippe: Celestial 6102P-001", "url": "https://www.patek.com/en/collection/grand-complications/6102p-001", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Following the Moon instead of just its face", "account": "Patek Philippe's Celestial shows lunar orbit alongside astronomical information. An orbit indication answers where the Moon is represented in its motion; a phase indication answers how much of its face appears illuminated. Putting them together makes a dial richer, but the two should never be mistaken for interchangeable decorations.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "moon-phase", "title": "Moon phase", "family": "Astronomy", "kind": "Complication", "aliases": [ "Lunar phase", "Phases de lune" ], "purpose": "Depicts the changing appearance of the Moon as seen from Earth.", "mechanism": "A representation moves behind an aperture or is indicated with a hand. This indicates illumination phase rather than the Moon's orbital position.", "history": { "date": "1983", "who": "Blancpain", "account": "Blancpain documents its moon-phase introduction in 1983. The original watch inventor is not established by that brand milestone.", "status": "Maker milestone" }, "fact": "Blancpain's familiar complete-calendar layout placed the moon-phase window at six o'clock.", "sources": [ { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Blancpain: The Phase of the Moon", "url": "https://lettresdubrassus.blancpain.com/en/issue-16/phase", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "A small sky beneath the crystal", "account": "Blancpain's documented 1983 moon-phase watch placed its lunar window at six o'clock within a complete-calendar layout. The image gives astronomical time a face beside everyday calendar numerals. This was a milestone for the brand, not evidence that the Moon first entered watchmaking in the 1980s.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "planetarium", "title": "Planetarium / heliocentric display", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Represent the solar system from a Sun-centred viewpoint.", "mechanism": "The Planetarium Copernicus places the Sun at the centre of its astronomical dial. Detailed construction varies by model.", "history": { "date": "1988: Planetarium Copernicus", "who": "Ludwig Oechslin / Ulysse Nardin", "account": "Ulysse Nardin dates its Planetarium to 1988, within Oechslin’s Trilogy of Time. This is a wristwatch example, not invention of the planetary model.", "status": "Maker milestone" }, "fact": "The Trilogy also included the Astrolabium in 1985 and Tellurium in 1992.", "sources": [ { "title": "Ulysse Nardin: Planetarium Copernicus", "url": "https://www.ulysse-nardin.com/en-eu/watches/classico/839-70", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Ulysse Nardin: astronomical complications and the Trilogy of Time", "url": "https://www.ulysse-nardin.com/about-us/unvrs/the-astronomical-complications", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "A solar system that fits on a wrist", "account": "Ulysse Nardin's 1988 Planetarium formed part of Ludwig Oechslin's Trilogy of Time, between the Astrolabium and Tellurium. The display shifts attention from appointments to planetary motion. Its appeal is scale: the same object that marks an ordinary hour can represent a much larger celestial arrangement.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "precision-moon-phase", "title": "Precision moon phase", "family": "Astronomy", "kind": "Display variant", "aliases": [ "Astronomical moon phase", "High-precision lunar phase" ], "purpose": "Uses a closer approximation of the lunar cycle to reduce the frequency of moon-phase correction.", "mechanism": "IWC's 2024 implementation inserts a reduction train with three intermediate wheels between the base movement and moon display.", "history": { "date": "2024", "who": "IWC", "account": "The Eternal Calendar introduced this specific high-precision gearing. It was not the first precision moon-phase watch.", "status": "Maker milestone" }, "fact": "IWC's one-day error after 45 million years is a mathematical estimate, not a claim of demonstrated continuous operation.", "sources": [ { "title": "IWC: Portugieser Eternal Calendar, 9 April 2024", "url": "https://press.iwc.com/iwc-portugieser-eternal-calendar-45-million-years-moon-phase-accuracy-en/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Chasing the fraction a gear cannot quite express", "account": "A mechanical lunar display approximates a natural cycle using gearing. IWC's Eternal Calendar takes that approximation remarkably far, publishing a theoretical one-day discrepancy after forty-five million years. The fascination is the arithmetic; that number describes a calculation, not a watch proven to have run for geological ages.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "running-equation", "title": "Running equation of time", "family": "Astronomy", "kind": "Display variant", "aliases": [ "Équation marchante", "Apparent solar-time hand" ], "purpose": "Directly displays apparent solar time with a second minute hand beside ordinary time.", "mechanism": "The cited implementation combines motion-work with an annual equation cam through a differential gear.", "history": { "date": "2003", "who": "Alain Zaugg / Frédéric Piguet", "account": "US20030031093A1, published in 2003, names Zaugg as inventor. It is a particular implementation, not the origin of the entire complication.", "status": "Patent" }, "fact": "The patent describes earlier Patek running-equation mechanisms, confirming that this filing was not the family's first invention.", "sources": [ { "title": "US20030031093A1: Running equation of time", "url": "https://patents.google.com/patent/US20030031093A1/en", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Two minute hands, two kinds of time", "account": "A running equation places apparent solar time beside ordinary time rather than asking the wearer to add a separate offset. Zaugg's published 2003 patent describes one construction and acknowledges earlier Patek mechanisms. The two hands make an abstract distinction visible: the Sun's schedule and a uniform clock schedule can coexist.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "sidereal-time", "title": "Sidereal time", "family": "Astronomy", "kind": "Complication", "aliases": [ "Star time" ], "purpose": "Measures Earth's rotation relative to stars rather than using ordinary solar-time days.", "mechanism": "Different gearing tracks the sidereal cycle. The cited glossary defines its daily duration as approximately 23 hours, 56 minutes and 4 seconds.", "history": { "date": "2011", "who": "IWC", "account": "IWC launched Sidérale Scafusia at ESO's Paranal Observatory in 2011. This is a modern documented example, not the invention of sidereal watches.", "status": "Maker milestone" }, "fact": "The observatory launch brought an astronomical wristwatch to a location used for observing the night sky.", "sources": [ { "title": "Patek Philippe: Glossary", "url": "https://www.patek.com/en/glossary", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "European Southern Observatory: IWC launch, 2011", "url": "https://eso.org/public/announcements/ann11056/", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "A watch whose reference is the stars", "account": "IWC launched Sidérale Scafusia at ESO's Paranal Observatory in 2011. The setting suited a watch that measures Earth's rotation against the stars rather than ordinary solar days. The story is a change of reference: familiar-looking time indications can describe a different astronomical rhythm.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "sky-chart", "title": "Sky chart", "family": "Astronomy", "kind": "Complication", "aliases": [ "Celestial map", "Star chart" ], "purpose": "Represents the configuration of the night sky, turning a dial into an astronomical reference.", "mechanism": "Patek's Celestial uses a moving chart to show apparent stellar movement and the position and phases of the Moon. The displayed sky is referenced to a particular hemisphere.", "history": { "date": "Not established", "who": "Patek Philippe", "account": "Celestial Ref. 6102R is a documented example. The original inventor and earliest watch implementation are not established by this product page.", "status": "Documented example" }, "fact": "The Celestial chart represents the northern hemisphere; it should not be described as an identical sky for every location.", "sources": [ { "title": "Patek Philippe: Celestial 6102R-001", "url": "https://www.patek.com/en/collection/grand-complications/6102r-001", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The dial becomes a night sky", "account": "Patek Philippe's Celestial presents a chart of the northern sky. Its moving celestial display invites the wearer to read a configuration of stars instead of another counter. Geography remains part of the interpretation: a chart representing the northern hemisphere is not a universal picture of the sky from every location.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "solar-culmination", "title": "Solar culmination time", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Indicates the time of the Sun's culmination.", "mechanism": "Mechanically displayed; the overview does not disclose the detailed gearing.", "history": { "date": "2025", "who": "Vacheron Constantin", "account": "Documented in Solaria.", "status": "Maker milestone" }, "fact": "It appears alongside position, height and declination.", "sources": [ { "title": "Vacheron Constantin: Solaria Ultra Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/cabinotiers-solaria.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "An appointment with the Sun", "account": "Solaria treats the time of solar culmination as its own indication. This is a reminder that a celestial event can deserve a separate place on a watch.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "solar-declination", "title": "Solar declination", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Indicates the Sun's angle of declination.", "mechanism": "Mechanically displayed; the overview does not disclose the detailed gearing.", "history": { "date": "2025", "who": "Vacheron Constantin", "account": "Documented in Solaria.", "status": "Maker milestone" }, "fact": "Declination is a separate Solaria indication.", "sources": [ { "title": "Vacheron Constantin: Solaria Ultra Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/cabinotiers-solaria.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "A solar angle gets its own dial", "account": "Vacheron Constantin distinguishes solar declination from its other Solaria indications. The story is precision of meaning: several readings can concern the Sun without measuring the same thing.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "solar-height", "title": "Solar height", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Indicates the Sun's height.", "mechanism": "Mechanically displayed; the overview does not disclose the detailed gearing.", "history": { "date": "2025", "who": "Vacheron Constantin", "account": "Documented in Solaria.", "status": "Maker milestone" }, "fact": "The maker distinguishes solar height from solar position.", "sources": [ { "title": "Vacheron Constantin: Solaria Ultra Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/cabinotiers-solaria.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Looking up, mechanically", "account": "Solaria separates the Sun's height from its position. A seemingly simple view of the sky becomes several distinct quantities, each asking something different of the mechanism.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "solar-position", "title": "Solar position", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Shows the Sun's position in real time.", "mechanism": "Mechanically displayed; the overview does not disclose the detailed gearing.", "history": { "date": "2025", "who": "Vacheron Constantin", "account": "Documented in Solaria.", "status": "Maker milestone" }, "fact": "Solar position is one of Solaria's five rare astronomical functions.", "sources": [ { "title": "Vacheron Constantin: Solaria Ultra Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/cabinotiers-solaria.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "The Sun as a moving reference", "account": "Among Solaria's five rare astronomical functions is a real-time solar-position indication. It gives celestial motion a mechanical presentation without reducing every solar reading to one generic sun symbol.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "sunrise-sunset", "title": "Sunrise and sunset", "family": "Astronomy", "kind": "Complication", "aliases": [ "Solar rising and setting times" ], "purpose": "Indicates daily sunrise and sunset for a defined geographical reference.", "mechanism": "IWC documents sunrise/sunset indications on Sidérale Scafusia alongside a sky chart customised to the owner's chosen location. The cited overview does not disclose the full solar mechanism.", "history": { "date": "2011", "who": "IWC", "account": "The watch's launch at ESO in 2011 establishes this implementation, not the original invention of sunrise/sunset watches.", "status": "Maker milestone" }, "fact": "Location matters: these are not universally interchangeable indications for every city.", "sources": [ { "title": "IWC: Time Machines", "url": "https://press.iwc.com/time-machines-en/", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "European Southern Observatory: IWC launch, 2011", "url": "https://eso.org/public/announcements/ann11056/", "supports": [ "history", "story" ] } ], "story": { "heading": "A calendar for the edges of daylight", "account": "Sidérale Scafusia's documented sunrise and sunset indications connect the watch to a defined geographical reference. They tell a more personal story than universal clock time: daylight belongs to a place. Move the context to another city, and the displayed information cannot simply be assumed to remain correct.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "celestial-tracking", "title": "Temporal tracking of celestial objects", "family": "Astronomy", "kind": "Complication", "aliases": [], "purpose": "Calculates when a star or constellation reaches the centre of the observer's view.", "mechanism": "Combines a split-seconds chronograph with a sky representation.", "history": { "date": "2025", "who": "Vacheron Constantin", "account": "Documented in Solaria.", "status": "Maker milestone" }, "fact": "Vacheron describes this combination as a world premiere.", "sources": [ { "title": "Vacheron Constantin: Solaria Ultra Grand Complication", "url": "https://www.vacheron-constantin.com/ae/en/watches/exceptional-timepieces/cabinotiers-solaria.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin: Timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Waiting for a star", "account": "Solaria combines functions to calculate when a star or constellation reaches the centre of the observer's view. Vacheron describes this specific combination as a world premiere; the claim belongs to the maker.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "tide-indicator", "title": "Tide indication", "family": "Astronomy", "kind": "Complication", "aliases": [ "Tidal display", "Tide graph" ], "purpose": "Represents tidal timing or tendency, often alongside lunar information.", "mechanism": "Ulysse Nardin's documented Blast Moonstruck connects tidal indication with a geocentric Sun/Moon display. IWC's different implementation indicates arrival of the next high and low tide.", "history": { "date": "2020; 2022", "who": "IWC; Ulysse Nardin", "account": "IWC introduced its own first tide-indicator watch in 2020; Blast Moonstruck followed in 2022. Neither establishes the universal origin.", "status": "Maker milestone" }, "fact": "A manufacturer's own first tide watch should not be called the world's first tide watch.", "sources": [ { "title": "Ulysse Nardin: Astronomical Complications", "url": "https://www.ulysse-nardin.com/about-us/unvrs/astronomical-complications-a-celestial-vision-signed-by-ulysse-nardin", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "IWC: Portugieser family, 24 April 2020", "url": "https://press.iwc.com/portugieser/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The Moon's influence becomes a coastal reading", "account": "IWC's 2020 tide-indicator introduction and Ulysse Nardin's 2022 Blast Moonstruck show different modern approaches to tidal information. The attraction is a connection between celestial cycles and the water beside us. A brand's first tide watch is a milestone in its own history, not automatically the first ever made.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "chronograph", "title": "Chronograph", "family": "Chronographs", "kind": "Complication", "aliases": [ "Elapsed-time chronograph", "Stopwatch function" ], "purpose": "Measure the duration of an event while a watch continues to display ordinary time.", "mechanism": "A controllable timing mechanism starts, stops and resets an elapsed-time display, commonly using pushers and dedicated hands or counters.", "history": { "date": "1816; 1821", "who": "Louis Moinet; Nicolas Rieussec", "account": "Moinet completed the Compteur de tierces in 1816 for astronomical measurement. Rieussec demonstrated an inking chronograph in 1821. These are distinct documented milestones in the development of elapsed-time instruments, not grounds for treating every later chronograph as one inventor's unchanged invention.", "status": "Maker milestone" }, "fact": "Moinet designed his instrument to measure sixtieths of a second for astronomical use.", "sources": [ { "title": "Louis Moinet Foundation — The Chronograph", "url": "https://www.louismoinet.org/chronograph-room/the-chronograph/", "supports": [ "history", "fact", "story" ] }, { "title": "Montblanc — Nicolas Rieussec Chronograph", "url": "https://www.montblanc.com/en-us/montblanc-star-legacy-nicolas-rieussec-chronograph-43-mm-limited-edition---821-pieces-MB136359.html", "supports": [ "history", "story" ] }, { "title": "Longines — Chronograph watches", "url": "https://www.longines.com/en-us/suggestions/movement/chronograph-watches", "supports": [ "purpose", "mechanism", "story" ] } ], "story": { "heading": "From observing the heavens to timing a moment", "account": "Louis Moinet's 1816 Compteur de tierces measured sixtieths of a second for astronomy. Nicolas Rieussec's 1821 inking instrument supplied another documented milestone. Those different beginnings make a better story than a single oversimplified inventor credit: elapsed-time measurement developed through instruments built for particular jobs.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "double-split", "title": "Double split", "family": "Chronographs", "kind": "Complication", "aliases": [ "Double rattrapante" ], "purpose": "Compare elapsed measurements lasting longer than one minute.", "mechanism": "Pairs of seconds and minute-counter hands can be stopped and reunited.", "history": { "date": "2004", "who": "A. Lange & Söhne", "account": "Lange introduced its DOUBLE SPLIT in 2004, documenting the extension of splitting to the minute counter.", "status": "Maker milestone" }, "fact": "Comparative readings extend to thirty minutes; disengagement reduces friction while split hands are held.", "sources": [ { "title": "A. Lange & Söhne — Double and triple rattrapante mechanisms", "url": "https://www.alange-soehne.com/us-en/manufacture/art-of-watchmaking/double-tripple-rattrapante-mechanism", "supports": [ "mechanism", "fact", "history", "story" ] }, { "title": "A. Lange & Söhne — Chronographs", "url": "https://www.alange-soehne.com/us-en/timepieces/selections/chronographs", "supports": [ "purpose", "history", "story" ] } ], "story": { "heading": "The race continues after the first minute", "account": "A split-seconds hand can compare short events, but a minute counter raises a new question when those events continue. Lange's 2004 DOUBLE SPLIT extended comparative readings to thirty minutes. Its disengagement mechanism addresses friction while split hands are held, showing that extending a display also changes the engineering underneath.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "retrograde-rattrapante", "title": "Double-retrograde split chronograph", "family": "Chronographs", "kind": "Display variant", "aliases": [ "Double retrograde rattrapante" ], "purpose": "Display comparative elapsed seconds on separate arcs.", "mechanism": "The split chronograph hands traverse opposing retrograde scales rather than sharing a full circular display.", "history": { "date": "2015", "who": "Vacheron Constantin", "account": "Reference 57260 is a documented 2015 example. This is a particular display and mechanism variant of split timing, not the original invention of the generic rattrapante.", "status": "Documented example" }, "fact": "The separated arcs make the two readings visibly distinct from a conventional superposed-hand rattrapante.", "sources": [ { "title": "Vacheron Constantin — Reference 57260", "url": "https://www.vacheron-constantin.com/de/en/watches/exceptional-timepieces/reference-57260.html", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Vacheron Constantin — Reference 57260, 2015 archive", "url": "https://cabinotiers.vacheron-constantin.com/EN/79-REFERENCE-57260-2015.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Two timings take separate paths", "account": "Vacheron Constantin's Reference 57260, presented in 2015, gives split timing a double-retrograde presentation. Instead of reading superposed hands, the observer sees distinct arcs. It is a striking example of a familiar function acquiring a new visual language, rather than proof that split-seconds timing itself began with this watch.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "flyback-chronograph", "title": "Flyback chronograph", "family": "Chronographs", "kind": "Complication", "aliases": [ "Retour en vol" ], "purpose": "Begin consecutive timed stages with one operation.", "mechanism": "A single actuation stops the current timing, sends its hands to zero and immediately begins another measurement.", "history": { "date": "16 June 1936", "who": "Longines", "account": "Longines received patent protection on this date and brought its 13ZN flyback calibre into serial production. Patent and production dates should not be presented as proof that no earlier working example existed.", "status": "Patent" }, "fact": "The function simplified timing successive stages of a flight.", "sources": [ { "title": "Longines — Flyback patent anniversary", "url": "https://mediacenter.longines.com/longines-marks-90-years-of-its-invention-of-the-flyback-chronograph/", "supports": [ "history", "fact", "story" ] }, { "title": "A. Lange & Söhne — Chronographs", "url": "https://www.alange-soehne.com/us-en/timepieces/selections/chronographs", "supports": [ "purpose", "mechanism", "story" ] } ], "story": { "heading": "The next interval begins with one action", "account": "Successive flight stages helped give flyback timing its practical purpose. Longines's patented 13ZN construction allowed a running chronograph to reset and restart through a single action. The appealing moment is the transition: a new measurement can begin without the wearer performing a separate stop, reset and start sequence.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "foudroyante", "title": "Foudroyante", "family": "Chronographs", "kind": "Complication", "aliases": [ "Flying seconds", "Lightning seconds" ], "purpose": "Make fractional seconds visible on a rapidly turning display.", "mechanism": "A dedicated hand completes a revolution each second, pausing at fractional steps corresponding to the movement's construction.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "FHH defines the function; Jaeger-LeCoultre documents modern Duometre applications. These examples do not establish who first invented all forms of flying seconds.", "status": "Origin unresolved" }, "fact": "FHH lists quarter-, fifth- and eighth-second versions. A foudroyante differs from a hand that advances only once per second.", "sources": [ { "title": "FHH — Foudroyante", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/foudroyante-jumping-seconds-or-hand-flying-seconds", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Jaeger-LeCoultre — Duometre history and calibres", "url": "https://www.jaeger-lecoultre.com/gb-en/jaeger-lecoultre-duometre-history", "supports": [ "history", "story" ] } ], "story": { "heading": "A second becomes a spectacle", "account": "A flying-seconds display breaks a second into visibly marked fractions. FHH describes quarter-, fifth- and eighth-second versions, while Jaeger-LeCoultre documents modern Duometre applications. Its rapid motion draws attention to how much can happen inside one second; it is a different indication from a hand advancing just once each second.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "high-frequency-chronograph", "title": "High-frequency fractional chronograph", "family": "Chronographs", "kind": "Display variant", "aliases": [ "Tenths chronograph", "Hundredths chronograph" ], "purpose": "Resolve smaller fractions of elapsed time using a faster regulating system.", "mechanism": "A higher-frequency oscillator supplies finer increments to the chronograph's indication; the dial scale alone does not create this resolution.", "history": { "date": "1969; 2017", "who": "Zenith", "account": "Zenith documents the 1969 El Primero and the later DEFY El Primero 21 with a 50 Hz chronograph regulator. These are manufacturer milestones, not an unqualified sole claim to every automatic chronograph.", "status": "Maker milestone" }, "fact": "The DEFY El Primero 21 measures hundredths of a second using its fast chronograph regulator.", "sources": [ { "title": "Zenith — Official timeline", "url": "https://www.zenith-watches.com/int/brand/timeline", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A separate heartbeat for tiny intervals", "account": "Zenith's story runs from the 1969 El Primero to the DEFY El Primero 21's fifty-hertz chronograph regulator. The latter measures hundredths of a second with its fast timing oscillator. The interesting engineering choice is to give elapsed-time measurement a regulator suited to smaller fractions, rather than merely print finer marks.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "minute-rattrapante", "title": "Minute rattrapante / time-on-demand marker", "family": "Chronographs", "kind": "Complication", "aliases": [], "purpose": "Mark a chosen interval directly against the ordinary minute indication.", "mechanism": "Pushers advance a second minute hand by one or five minutes. The regular minute hand approaches this chosen marker as time passes.", "history": { "date": "2023", "who": "Parmigiani Fleurier", "account": "The Tonda PF Minute Rattrapante was presented in 2023. This is the documented introduction of the named implementation.", "status": "Maker milestone" }, "fact": "The one-minute and five-minute pushers sit at 10 and 8 o’clock respectively.", "sources": [ { "title": "Parmigiani Fleurier: Tonda PF Minute Rattrapante", "url": "https://www.parmigiani.com/en/watches/tonda-pf-minute-rattrapante/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A reminder without a stopwatch", "account": "Parmigiani's 2023 Minute Rattrapante moves a second minute hand ahead in one- or five-minute steps. The ordinary minute hand then catches up to that marker. It offers a visual way to set a short future interval; the rattrapante idea is used here for a rendezvous between hands, not a conventional split chronograph.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "monopusher-chronograph", "title": "Monopusher chronograph", "family": "Chronographs", "kind": "Display variant", "aliases": [ "Single-pusher chronograph" ], "purpose": "Control elapsed-time measurement through one chronograph button.", "mechanism": "The same pusher commands the start, stop and reset sequence.", "history": { "date": "1915", "who": "Gaston Breitling / Breitling", "account": "Breitling documents its independent wristwatch chronograph pusher at two o'clock in 1915. This is a specific wristwatch-control milestone; chronographs and single-button controls existed earlier.", "status": "Maker milestone" }, "fact": "The independent pusher separated chronograph operation from the winding crown.", "sources": [ { "title": "Breitling — Official history", "url": "https://www.breitling.com/ca-en/about/history/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "One button tells the whole sequence", "account": "Breitling's 1915 independent wristwatch pusher separated chronograph control from the winding crown. A monopusher organizes start, stop and reset around a single control. Its simplicity is visible on the case, even though the mechanism must remember which operation comes next whenever the wearer presses again.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "split-seconds-chronograph", "title": "Split-seconds chronograph", "family": "Chronographs", "kind": "Complication", "aliases": [ "Rattrapante", "Double chronograph" ], "purpose": "Hold an intermediate time while the main elapsed-time hand continues.", "mechanism": "Two superposed seconds hands can be separated by stopping one; releasing it makes it catch up with the continuing hand.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "Lange documents the operating principles rather than a definitive original inventor. Its technical account explains concentric arbors, an arresting clamp and a mechanism that rejoins the hands.", "status": "Origin unresolved" }, "fact": "The catching-up hand gives the rattrapante function its name.", "sources": [ { "title": "A. Lange & Söhne — Chronographs", "url": "https://www.alange-soehne.com/us-en/timepieces/selections/chronographs", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "One hand pauses while the other keeps the promise", "account": "Two elapsed-seconds hands begin together. Hold one for an intermediate reading and the other continues; release it and the held hand catches up. Lange's technical account describes the concentric arbors and arresting clamp behind that little drama. Rattrapante names the catching-up action, making the mechanism's behaviour part of its name.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "triple-split", "title": "Triple split", "family": "Chronographs", "kind": "Complication", "aliases": [ "Triple rattrapante" ], "purpose": "Compare events lasting hours as well as seconds and minutes.", "mechanism": "A third pair of split hands adds comparative elapsed-hour measurement to the seconds and minute pairs.", "history": { "date": "2018", "who": "A. Lange & Söhne", "account": "The TRIPLE SPLIT introduced in 2018 extends the manufacturer's 2004 double-split architecture to elapsed hours.", "status": "Maker milestone" }, "fact": "It compares events lasting up to twelve hours. The slow hour axis does not require the seconds and minutes' friction-reduction mechanism.", "sources": [ { "title": "A. Lange & Söhne — Double and triple rattrapante mechanisms", "url": "https://www.alange-soehne.com/us-en/manufacture/art-of-watchmaking/double-tripple-rattrapante-mechanism", "supports": [ "mechanism", "fact", "story" ] }, { "title": "A. Lange & Söhne — Triple Split", "url": "https://press.alange-soehne.com/triple-split/", "supports": [ "purpose", "history", "story" ] } ], "story": { "heading": "Comparing journeys that last hours", "account": "Lange's 2018 TRIPLE SPLIT carried its earlier double-split architecture into elapsed hours, permitting comparisons up to twelve hours. Its slow hour axis does not require the seconds and minutes' friction-reduction arrangement. That detail makes the story more interesting than simply adding another hand: each timescale brings different mechanical demands.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "two-pusher-chronograph", "title": "Two-pusher chronograph", "family": "Chronographs", "kind": "Display variant", "aliases": [ "Dual-pusher chronograph" ], "purpose": "Pause and resume timing without necessarily returning the elapsed-time hands to zero.", "mechanism": "One pusher controls start and stop; another commands reset.", "history": { "date": "1933 patent filing; 1934 production", "who": "Willy Breitling / Breitling", "account": "The current manufacturer history records a patent filing in 1933 and industrial production the following year. This is the documented development of its familiar separate reset pusher.", "status": "Maker milestone" }, "fact": "The second pusher was positioned at four o'clock.", "sources": [ { "title": "Breitling — Official history", "url": "https://www.breitling.com/ca-en/about/history/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The case learns a second command", "account": "Breitling's history records a separate reset-pusher patent filing in 1933 and industrial production the following year. The additional button at four o'clock helped create the familiar two-pusher layout. It is an interface story as much as a timing story: the controls tell the wearer which actions can be performed separately.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "caller-gmt", "title": "Caller GMT", "family": "Travel time", "kind": "Complication", "aliases": [ "office GMT", "independent GMT hand" ], "purpose": "Track another region while remaining in your own time zone.", "mechanism": "The 24-hour reference hand can be adjusted independently without disturbing the time-of-day hands.", "history": { "date": "2023", "who": "Seiko", "account": "Seiko’s 8 March 2023 Prospex announcement documents this arrangement in its three-day 6R54 movement. The source does not establish an original inventor.", "status": "Documented example" }, "fact": "Caller and traveller describe which hour hand adjusts independently, rather than different numbers of time zones.", "sources": [ { "title": "Seiko Prospex GMT announcement", "url": "https://www.seikowatches.com/middleeast-en/news/20230308-3", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Jack Mason traveller versus caller GMT", "url": "https://jackmasonbrand.com/pages/meet-stratotimer-gmt", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Travel elsewhere without leaving your desk", "account": "A caller GMT independently adjusts the second-zone hand, making another location convenient to follow while local time stays put. Seiko's 2023 6R54 announcement documents this arrangement. The name describes the adjustment behaviour; it does not mean the watch has fewer time zones than a traveller-style GMT.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "day-night", "title": "Day/night indication", "family": "Travel time", "kind": "Complication", "aliases": [ "AM/PM indicator" ], "purpose": "Distinguish morning from evening when an hour hand uses a 12-hour scale.", "mechanism": "An additional indication follows the relevant time zone and identifies its day or night period.", "history": { "date": "2022 example; original origin unresolved", "who": "Patek Philippe", "account": "The March 2022 reference 5326G announcement documents separate home-time and local-time windows. It does not identify the first day/night indicator.", "status": "Documented example" }, "fact": "This watch places the local-time window at 8 o’clock and the home-time window at 4 o’clock.", "sources": [ { "title": "Patek Philippe Annual Calendar Travel Time, March 2022", "url": "https://static.patek.com/pdf/pressreleases/en/2022_PatekPhilippe_Annual_Calendar_Travel_Time_5326G.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Is home asleep or awake?", "account": "A twelve-hour home-time hand can leave a traveller with an important ambiguity. Patek's reference 5326G gives home and local time their own day/night windows. These modest indicators make a second timezone usable at a glance, reminding us that a complication can solve a very small but very real reading problem.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "travel-time", "title": "Dual 12-hour / Travel Time", "family": "Travel time", "kind": "Complication", "aliases": [ "home time", "local time" ], "purpose": "Show home and local hours on a familiar 12-hour dial.", "mechanism": "A second central hour hand and day/night windows distinguish the two times; a clutch permits local-hour changes without interrupting the movement.", "history": { "date": "1959 patent; 1997 launch", "who": "Patek Philippe", "account": "Patek’s Travel Time clutch is based on its 1959 patent. The manufacturer documents a new Travel Time launch in 1997.", "status": "Patent" }, "fact": "In the 2022 reference 5326G, local-time changes also coordinate the calendar date.", "sources": [ { "title": "Patek Philippe Annual Calendar Travel Time, March 2022", "url": "https://static.patek.com/pdf/pressreleases/en/2022_PatekPhilippe_Annual_Calendar_Travel_Time_5326G.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Home stays while the traveller moves", "account": "Patek Philippe links its Travel Time clutch to a 1959 patent and documents a later launch in 1997. Two hour readings let the wearer keep home alongside local time. In reference 5326G, changing local time also coordinates the date, bringing the calendar into the travel story rather than leaving it behind.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "gmt", "title": "GMT / second time zone", "family": "Travel time", "kind": "Complication", "aliases": [ "GMT hand", "dual time" ], "purpose": "Keep a second location’s time visible while reading local time.", "mechanism": "A dedicated hand completes one revolution in 24 hours and is read against a 24-hour scale.", "history": { "date": "1955", "who": "Rolex", "account": "Rolex introduced the GMT-Master for professionals making intercontinental journeys. This is a documented product milestone, not the origin of all dual-time watches.", "status": "Maker milestone" }, "fact": "The GMT-Master II added an independently adjustable local-hour hand in 1982.", "sources": [ { "title": "Rolex GMT-Master II history", "url": "https://newsroom.rolex.com/watches/oyster-collection/gmt-master-ii", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Rolex time zone to time zone", "url": "https://www.rolex.com/en-us/watches/gmt-master-ii/time-zone-to-time-zone", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Two places share one dial", "account": "Rolex's 1955 GMT-Master was made for professionals undertaking intercontinental journeys. Its extra time reference addresses a modern travel problem without replacing ordinary local time. The later GMT-Master II added independent local-hour adjustment in 1982, a useful distinction when comparing watches that all carry the same broad GMT label.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "gmt-rattrapante", "title": "GMT rattrapante", "family": "Travel time", "kind": "Complication", "aliases": [], "purpose": "Expose a second time zone on demand, then return to a single visible hour hand.", "mechanism": "A pusher advances one hour hand in one-hour steps while the home-time hand stays in place. The crown pusher reunites the hands.", "history": { "date": "2022", "who": "Parmigiani Fleurier", "account": "The Tonda PF GMT Rattrapante debuted in 2022; the manufacturer describes this implementation as a world premiere.", "status": "Maker milestone" }, "fact": "Here “rattrapante” refers to reuniting the hour hands rather than splitting a chronograph’s elapsed seconds.", "sources": [ { "title": "Parmigiani Fleurier: Tonda PF GMT Rattrapante", "url": "https://www.parmigiani.com/en/collections/tonda-pf/tonda-pf-gmt-rattrapante/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Home time hides in plain sight", "account": "Parmigiani's 2022 Tonda PF GMT Rattrapante lets the hour hands reunite when the second time reference is no longer needed. The manufacturer describes this named implementation as a world premiere. Its charm lies in restraint: information appears when wanted and can return to a simpler dial through the catching-up action.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "traveller-gmt", "title": "Traveller GMT", "family": "Travel time", "kind": "Complication", "aliases": [ "traveler GMT", "flyer GMT" ], "purpose": "Change local time quickly when crossing time zones while retaining a home-time reference.", "mechanism": "The local-hour hand jumps independently; the minute and 24-hour hands retain their positions.", "history": { "date": "1982", "who": "Rolex", "account": "The GMT-Master II introduced Rolex’s independent local-hour adjustment. The date identifies this implementation rather than a universal invention.", "status": "Maker milestone" }, "fact": "An hour adjustment does not require resetting the minute hand.", "sources": [ { "title": "Rolex time zone to time zone", "url": "https://www.rolex.com/en-us/watches/gmt-master-ii/time-zone-to-time-zone", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Jack Mason traveller versus caller GMT", "url": "https://jackmasonbrand.com/pages/meet-stratotimer-gmt", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Landing without disturbing the minutes", "account": "Rolex's 1982 GMT-Master II documented independent adjustment of the local-hour hand. The traveller can change the hour reference while retaining home time and the minute setting. This explains the practical label: the watch's controls are organized around the wearer moving to a new place.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "world-time", "title": "World time", "family": "Travel time", "kind": "Complication", "aliases": [ "universal time", "heure universelle", "worldtimer" ], "purpose": "Read several locations’ times together.", "mechanism": "A city scale and a 24-hour indication relate geographic locations to their corresponding hours.", "history": { "date": "1930s", "who": "Louis Cottier", "account": "Patek Philippe identifies Cottier as the developer of its world-time mechanism in the 1930s; Vacheron Constantin documents a Cottier-system collaboration in 1932.", "status": "Maker milestone" }, "fact": "The city names act as references for time zones rather than separate clock movements.", "sources": [ { "title": "Patek Philippe World Time 7129J", "url": "https://www.patek.com/en/collection/complications/7129j-001", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Vacheron Constantin Cottier timeline", "url": "https://www.vacheron-constantin.com/ww/th/maison/timeline.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A conversation across the world", "account": "Louis Cottier's world-time mechanism, developed in the 1930s, coordinated a city reference with a twenty-four-hour ring. Patek Philippe credits his development, and Vacheron documents a collaboration in 1932. The cleverness is shared arithmetic: the city names do not require a separate clock movement for every destination.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "alarm-with-time-strike", "title": "Alarm with time strike", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Striking time alarm" ], "purpose": "Announce the programmed alarm time as an audible time reading rather than a generic ringing signal.", "mechanism": "The alarm uses the minute-repeater mechanism to sound the selected hours, quarters and minutes.", "history": { "date": "October 2014", "who": "Patek Philippe", "account": "The Grandmaster Chime 5175's original release documents this patented mechanism and describes its mechanical wristwatch introduction as a world debut. Credit the manufacturer, not an individual inventor not named for this mechanism.", "status": "Maker milestone" }, "fact": "The same gongs and time-encoding sequence serve the alarm and repeater.", "sources": [ { "title": "Patek Philippe — Original Grandmaster Chime release, October 2014", "url": "https://static.patek.com/pdf/pressreleases/ru/2014_PatekPhilippe_GrandmasterChime_5175R.pdf", "supports": [ "mechanism", "history", "fact", "story" ] }, { "title": "Patek Philippe — Grandmaster Chime 6300GR", "url": "https://www.patek.com/en/en/collection/grand-complications/6300gr-001", "supports": [ "purpose" ] } ], "story": { "heading": "An alarm that tells you why it is ringing", "account": "An ordinary alarm attracts attention; Patek's Grandmaster Chime alarm can sound the programmed time using a time-encoding striking sequence. The original reference 5175 release describes this patented construction. Reusing the language of a repeater turns a reminder into a message the owner can interpret by listening.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "carillon-westminster", "title": "Carillon and Westminster striking", "family": "Sound & touch", "kind": "Mechanism variant", "aliases": [ "Musical striking", "Westminster chime" ], "purpose": "Provide richer musical sequences than ordinary two-tone repetition.", "mechanism": "Several tuned gongs create melodic strike patterns. Westminster names a particular melody, while carillon describes a broader multi-gong arrangement.", "history": { "date": "1910 documented example", "who": "Patek Philippe", "account": "The Duc de Regla pocket watch sold in 1910 includes Westminster striking on five gongs. This is a documented watch example, not proof of the original inventor of carillon or Westminster watch mechanisms.", "status": "Documented example" }, "fact": "Westminster and carillon are related terms rather than interchangeable names for every musical striking system.", "sources": [ { "title": "Patek Philippe — Grande Sonnerie 6301P original 2020 release", "url": "https://static.patek.com/pdf/pressreleases/en/2020_PatekPhilippe_Grande%20Sonnerie_Ref_6301P.pdf", "supports": [ "mechanism", "history", "fact", "story" ] }, { "title": "Audemars Piguet — Grande Sonnerie Carillon Supersonnerie", "url": "https://www.audemarspiguet.com/us/en/watch-collection/code-1159/26397QA.OO.D002KB.01", "supports": [ "purpose" ] } ], "story": { "heading": "A tower-clock atmosphere in a pocket", "account": "Patek's Duc de Regla pocket watch, sold in 1910, included Westminster striking on five gongs. Multiple tones let a watch do more than count out a simple signal. Carillon describes a broader striking arrangement; Westminster identifies a particular musical pattern, so the terms should not be treated as interchangeable.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "date-repeater", "title": "Date repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Audible date", "Date strike" ], "purpose": "Sound the calendar date on request.", "mechanism": "The perpetual calendar supplies the date; double high-low tones encode tens and single high tones encode units.", "history": { "date": "October 2014", "who": "Thierry Stern / Patek Philippe", "account": "The original Grandmaster Chime 5175 release identifies Thierry Stern as the inventor of its patented date-repeater mechanism. This names the inventor of the documented construction rather than inferring a name from an unrelated watchmaker.", "status": "Maker milestone" }, "fact": "The twenty-third sounds two double tones followed by three single tones.", "sources": [ { "title": "Patek Philippe — Original Grandmaster Chime release, October 2014", "url": "https://static.patek.com/pdf/pressreleases/ru/2014_PatekPhilippe_GrandmasterChime_5175R.pdf", "supports": [ "mechanism", "history", "fact", "story" ] }, { "title": "Patek Philippe — Grandmaster Chime 6300GR", "url": "https://www.patek.com/en/en/collection/grand-complications/6300gr-001", "supports": [ "purpose" ] } ], "story": { "heading": "The calendar learns to speak", "account": "The Grandmaster Chime's date repeater translates the date into counted tones. The original release names Thierry Stern as inventor of the patented construction. For the twenty-third, two double tones and three single tones carry the number. It is a wonderfully literal expansion of repetition: the watch voices the calendar instead of only the time.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "decimal-minute-repeater", "title": "Decimal minute repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Decimal repeater" ], "purpose": "Sound time in an hours, tens and units pattern.", "mechanism": "Hours are followed by ten-minute groups and then remaining individual minutes.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "Kari Voutilainen documents Masterpiece 6, and Lange documents the Zeitwerk implementation. These specific constructions are not proof of the original invention of every decimal repeater.", "status": "Origin unresolved" }, "fact": "At 7:52, the Zeitwerk example sounds seven low tones, five double tones and two high tones.", "sources": [ { "title": "Kari Voutilainen — Masterpiece 6 Decimal Repeater", "url": "https://www.voutilainen.ch/portfolio/masterpiece-6-decimal-repeater/", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "A. Lange & Söhne — Decimal minute repeater mechanism", "url": "https://www.alange-soehne.com/sa-en/manufacture/art-of-watchmaking/decimal-minute-repeater", "supports": [ "mechanism", "fact", "story" ] } ], "story": { "heading": "Hearing time in groups of ten", "account": "At 7:52, Lange's Zeitwerk decimal repeater sounds seven low tones, five double tones and two high tones. Grouping minutes into tens makes the audible structure differ from a quarter-based repeater. Kari Voutilainen's Masterpiece 6 provides another documented construction; neither example alone proves the origin of every decimal repeater.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "five-minute-repeater", "title": "Five-minute repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Five-minute repetition" ], "purpose": "Report time on demand to five-minute resolution.", "mechanism": "The striking system encodes elapsed time in five-minute divisions; the exact sequence depends on the construction.", "history": { "date": "1916 maker milestone", "who": "Patek Philippe", "account": "Patek Philippe documents its first chiming wristwatch in 1916: a ladies' five-minute repeater. This is the manufacturer's milestone, not the original invention of five-minute repetition.", "status": "Maker milestone" }, "fact": "That documented wristwatch had a platinum case and bracelet.", "sources": [ { "title": "Patek Philippe — Grande Sonnerie 6301P original 2020 release", "url": "https://static.patek.com/pdf/pressreleases/en/2020_PatekPhilippe_Grande%20Sonnerie_Ref_6301P.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A voice in five-minute steps", "account": "Patek Philippe's first documented chiming wristwatch was a ladies' five-minute repeater in 1916, made with a platinum case and bracelet. Its historical interest is the move into a wristwatch format. The interval tells the listener how finely the watch reports minutes, not how often it automatically rings.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "grande-sonnerie", "title": "Grande sonnerie", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Grand strike" ], "purpose": "Announce hours and quarter-hours automatically.", "mechanism": "At each quarter-hour, the striking sequence repeats the hour before sounding the quarters.", "history": { "date": "1850 maker milestone", "who": "Patek Philippe", "account": "Patek's journals record grande-sonnerie pocket watches in 1850. This documents its production, not the original invention of automatic striking.", "status": "Maker milestone" }, "fact": "Its 6301P example can perform 1,056 strikes in twenty-four hours.", "sources": [ { "title": "FHH — Grande sonnerie", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/grande-sonnerie", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Patek Philippe — Grande Sonnerie 6301P original 2020 release", "url": "https://static.patek.com/pdf/pressreleases/en/2020_PatekPhilippe_Grande%20Sonnerie_Ref_6301P.pdf", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "A watch that announces time on its own", "account": "A repeater waits to be asked; a grande sonnerie strikes automatically as time passes. Patek's journals record examples in 1850, and its modern 6301P can make 1,056 strikes in twenty-four hours. Behind the sound is an energy story: repeated striking demands much more than a beautiful set of gongs.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "half-quarter-repeater", "title": "Half-quarter repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Half-quarter repetition" ], "purpose": "Give more detail than quarter repetition without resolving each minute.", "mechanism": "An additional indication marks an elapsed half-quarter, or seven and a half minutes.", "history": { "date": "Circa 1750 documented example", "who": "John Ellicott", "account": "Science Museum Group holds an Ellicott half-quarter repeater from about 1750. The consulted sources do not settle the first inventor of the half-quarter variant.", "status": "Documented example" }, "fact": "The museum example uses a horizontal escapement.", "sources": [ { "title": "FHH — Repeater", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/repeater", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Science Museum Group — Ellicott half-quarter repeater", "url": "https://collection.sciencemuseumgroup.org.uk/objects/co407/half-quater-repeater-with-horizontal-escapement-pocket-watch-repeater-timepiece-instrument-component", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "Filling the silence between quarters", "account": "Science Museum Group holds an Ellicott half-quarter repeater dated to about 1750. The finer indication narrows the interval between quarter readings. That surviving object lets us discuss the construction without inventing a sole originator, and shows that watchmakers explored several levels of audible precision long before modern wristwatch examples.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "local-time-world-repeater", "title": "Local-time world-time repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "World Time Minute Repeater" ], "purpose": "Sound the selected local time when the watch's world-time location changes.", "mechanism": "The repeater samples the selected local-time indication rather than continuing to sound a fixed home time.", "history": { "date": "2017", "who": "Patek Philippe", "account": "The manufacturer's Reference 5531 instructions document the model's 2017 introduction and its local-time striking behavior. Treat this as a specific world-time and repeater combination, rather than the invention of generic repeaters or world-time watches.", "status": "Maker milestone" }, "fact": "Selecting a different world-time city changes which local time the repeater sounds.", "sources": [ { "title": "Patek Philippe — Reference 5531 instructions", "url": "https://static.patek.com/pdf/instructionsforuse/PatekPhilippe_5531G_001_en_fr.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The watch speaks where you are", "account": "Patek's Reference 5531 combines world time with a repeater that sounds the selected local time. Change the city reference and the audible time changes with it. The documented 2017 introduction is a story of coordination: two complications have to agree which place the wearer is asking about.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "mechanical-alarm", "title": "Mechanical alarm", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Alarm watch", "Réveil" ], "purpose": "Alert the wearer at a selected time.", "mechanism": "A set-time mechanism releases mechanical striking work rather than merely displaying the alarm time.", "history": { "date": "Circa 1625–1635 documented example", "who": "Jean Vallier, Lyon", "account": "The British Museum records an alarm watch by Vallier from this period. This establishes an early surviving example, not the original alarm inventor. Vulcain's 1947 Cricket is a later wristwatch milestone.", "status": "Documented example" }, "fact": "Alarm watches predate the twentieth-century Cricket wristwatch by centuries.", "sources": [ { "title": "British Museum — Jean Vallier alarm watch", "url": "https://www.britishmuseum.org/collection/object/H_1888-1201-177", "supports": [ "history", "story" ] }, { "title": "Swiss National Museum — Watch of presidents", "url": "https://blog.nationalmuseum.ch/en/2018/03/the-watch-of-presidents/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A reminder older than the wristwatch", "account": "The British Museum's early Vallier alarm watch places the function centuries before Vulcain's 1947 Cricket wristwatch milestone. This history is a useful surprise: portable mechanical reminders did not begin with twentieth-century wristwatches. Different eras found ways to turn stored energy into a signal at an appointed time.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "minute-repeater", "title": "Minute repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Minute repetition" ], "purpose": "Make the time audible on demand to the nearest minute.", "mechanism": "The mechanism sounds hours, elapsed quarters, then the minutes since the last quarter.", "history": { "date": "Circa 1738; 1755 documented examples", "who": "Ellicott-signed watch, actual maker uncertain; Thomas Mudge", "account": "British Museum curators date an Ellicott-signed English example to about 1738 and explicitly leave its actual maker uncertain. Mudge's 1755 clock-watch is documented. These records do not support an unqualified statement that Mudge invented minute repetition in 1750.", "status": "Documented example" }, "fact": "Mudge's watch could be activated by pushing its pendant.", "sources": [ { "title": "British Museum — Thomas Mudge minute-repeating clock-watch", "url": "https://www.britishmuseum.org/collection/object/H_1984-0301-1", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Time becomes a sequence you can hear", "account": "A British Museum example signed Ellicott is dated to about 1738, although its actual maker remains uncertain; Mudge's 1755 clock-watch supplies another documented example. The historical trail is richer than a tidy single-inventor date. On demand, the mechanism turns hours, quarters and remaining minutes into an audible reading.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "passing-strike", "title": "Passing strike", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Sonnerie au passage", "Hour strike", "Half-hour passing strike" ], "purpose": "Announce a time boundary automatically.", "mechanism": "A passing-strike mechanism activates as the specified hour, half-hour or other interval arrives instead of waiting for a repeater request.", "history": { "date": "First half of seventeenth century documented example", "who": "Maker unknown; initials LP", "account": "The British Museum records an early hour-striking watch whose maker is unknown. This example does not establish the original inventor of every passing-strike interval.", "status": "Documented example" }, "fact": "Lange's 2011 Zeitwerk Striking Time sounds hour and quarter boundaries; its 2017 Decimal Strike uses ten-minute boundaries.", "sources": [ { "title": "British Museum — Early hour-striking watch", "url": "https://www.britishmuseum.org/collection/object/H_1874-0718-7", "supports": [ "history", "story" ] }, { "title": "A. Lange & Söhne — Striking mechanisms", "url": "https://www.alange-soehne.com/eu-en/timepieces/selections/minute-repeater-and-other-striking-mechanisms", "supports": [ "fact", "story" ] }, { "title": "FHH — Repeater and complication strikes", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/repeater", "supports": [ "purpose", "mechanism", "story" ] } ], "story": { "heading": "Marking the boundary as it arrives", "account": "An early hour-striking watch in the British Museum shows time announcing itself without a request, though its maker is unknown. Modern Lange examples strike at quarter or ten-minute boundaries. The story differs from a repeater: a passing strike marks a moment as it happens instead of reciting a time selected by the wearer.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "petite-sonnerie", "title": "Petite sonnerie", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Small strike" ], "purpose": "Announce time automatically with a reduced strike program.", "mechanism": "Hours sound at the hour; quarter-hour sequences omit repeating the hour beforehand.", "history": { "date": "2013 documented example", "who": "A. Lange & Söhne", "account": "Lange's 2013 Grand Complication provides a documented example. The consulted sources do not identify a settled original inventor of petite sonnerie.", "status": "Documented example" }, "fact": "The same watch includes grande sonnerie and minute repetition; the owner selects the desired strike mode.", "sources": [ { "title": "FHH — Petite sonnerie", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/petite-sonnerie", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "A. Lange & Söhne — Striking mechanisms", "url": "https://www.alange-soehne.com/eu-en/timepieces/selections/minute-repeater-and-other-striking-mechanisms", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "Choosing how much the watch says", "account": "Lange's 2013 Grand Complication includes petite sonnerie alongside grande sonnerie and minute repetition. The selectable modes make striking behaviour part of ownership, not just a fixed spectacle. The useful comparison is when the hours are repeated: petite and grande arrangements announce quarter boundaries with different amounts of information.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "quarter-repeater", "title": "Quarter repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Quarter repetition" ], "purpose": "Tell the time on demand without viewing the dial.", "mechanism": "The mechanism sounds completed hours followed by elapsed quarter-hours.", "history": { "date": "1676; 1685; 1687 milestones", "who": "Edward Barlow; Thomas Tompion; Daniel Quare", "account": "The Met records Barlow's repeating clock mechanism in 1676, Tompion's watch for Barlow in 1685, and Quare's successful competing watch in the royal comparison of 1687. This is a development involving several makers.", "status": "Maker milestone" }, "fact": "The Met's George Graham example activates through its pendant and strikes a bell inside the case.", "sources": [ { "title": "Metropolitan Museum — George Graham quarter repeater", "url": "https://www.metmuseum.org/art/collection/search/201404", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A contest of makers, not one neat origin", "account": "The Met's account follows Barlow's repeating clock mechanism, Tompion's watch for him, and Quare's successful competing watch in a royal comparison in 1687. Its Graham example strikes a bell after pendant activation. The surviving narrative shows repeaters developing through competing constructions rather than appearing fully formed under a single famous name.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "digital-display-repeater", "title": "Repeater with mechanical digital display", "family": "Sound & touch", "kind": "Display variant", "aliases": [ "Jumping-numeral repeater" ], "purpose": "Combine audible time indication with a mechanical numeral display.", "mechanism": "Stepped snails sample the hour ring and minute discs to determine the number of strikes.", "history": { "date": "2015", "who": "A. Lange & Söhne", "account": "The Zeitwerk Minute Repeater introduced in 2015 is a documented combination of jumping numerals and decimal repetition. Mechanical digital describes its numeral display; it does not mean an electronic talking watch.", "status": "Maker milestone" }, "fact": "Numeral changes are delayed during striking so the heard time agrees with the visible display.", "sources": [ { "title": "A. Lange & Söhne — Decimal minute repeater mechanism", "url": "https://www.alange-soehne.com/sa-en/manufacture/art-of-watchmaking/decimal-minute-repeater", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "A. Lange & Söhne — Zeitwerk Minute Repeater introduction", "url": "https://press.alange-soehne.com/zeitwerk-minute-repeater/", "supports": [ "history", "story" ] } ], "story": { "heading": "What you hear must match what you see", "account": "Lange's 2015 Zeitwerk Minute Repeater pairs mechanical jumping numerals with decimal striking. During repetition, numeral changes are delayed so the visible and audible time agree. That small safeguard exposes a larger design problem: two ways of telling time must remain synchronized while a performance takes place.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "ten-minute-repeater", "title": "Ten-minute repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Ten-minute repetition" ], "purpose": "Report time on demand using ten-minute divisions instead of quarter-hours.", "mechanism": "The repeater encodes elapsed ten-minute intervals. Unlike decimal minute repetition, the category does not necessarily add individual minutes.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "FHH lists the variant; the British Museum classifies object 1958,1201.510 as a ten-minute-repeating watch. Its record describes half-ten-minute repeat, illustrating that historical classifications can include finer variants.", "status": "Origin unresolved" }, "fact": "Ten-minute repetition should not be treated as a synonym for every decimal minute repeater.", "sources": [ { "title": "British Museum — Ten-minute repeating watch", "url": "https://www.britishmuseum.org/collection/object/H_1958-1201-510", "supports": [ "history", "story" ] }, { "title": "FHH — Minute repeater complications", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/minute-repeater-complications", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "A different vocabulary of intervals", "account": "A ten-minute repeater divides the audible minute reading into a different set of steps from a quarter repeater. The British Museum's recorded example includes a finer half-ten-minute classification. Historical names can be surprisingly specific, so a ten-minute label should not be used as a blanket synonym for every decimal striking mechanism.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "tact-watch", "title": "À tact time display", "family": "Sound & touch", "kind": "Display variant", "aliases": [ "Tact watch", "Touch watch", "Montre à tact" ], "purpose": "Allow time to be read by touch alone.", "mechanism": "An external pointer mirrors the hour hand; the wearer compares its position with studs aligned to the hours.", "history": { "date": "1799 marketed introduction", "who": "Abraham-Louis Breguet", "account": "Breguet marketed this tactile system from 1799. The Louvre identifies the mechanism as his invention. Unlike a dumb repeater, it reads a pointer rather than counting felt hammer strikes.", "status": "Maker milestone" }, "fact": "Breguet No. 611 was sold to Madame Bonaparte, later Empress Josephine, on 18 February 1800; most tact watches were nonstriking.", "sources": [ { "title": "Breguet — Sale of the first tact watch", "url": "https://www.breguet.com/en/breguet-house/1775-1801/sale-first-tact-watch", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Louvre — Breguet tact watch", "url": "https://mini-site.louvre.fr/breguet/EN/html/1.2.1.2.html", "supports": [ "history", "story" ] } ], "story": { "heading": "Reading time discreetly, by touch", "account": "Breguet marketed his tactile system from 1799. An external pointer and tactile reference points let the owner read it without opening the dial; No. 611 was sold to Madame Bonaparte in 1800. The story is discreet access to information. It works differently from counting a dumb repeater's felt strikes.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "dumb-repeater", "title": "À toc / dumb repeater", "family": "Sound & touch", "kind": "Complication", "aliases": [ "Silent repeater", "Tactile repeater", "À toc" ], "purpose": "Communicate repeated time through felt pulses when audible striking is undesirable.", "mechanism": "A mechanism suppresses the bell sound while allowing hammer impulses to create vibrations.", "history": { "date": "1719–1720 documented example", "who": "George Graham", "account": "The Met's quarter-repeating Graham watch has a pulse piece that lifts the hammers away from its bell. This is a documented tactile implementation; the original inventor of all dumb repeaters remains unestablished in the consulted sources.", "status": "Documented example" }, "fact": "Its vibrations could be felt without the bell being heard.", "sources": [ { "title": "Metropolitan Museum — George Graham quarter repeater", "url": "https://www.metmuseum.org/art/collection/search/201404", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The repeater keeps its voice to itself", "account": "The Met's Graham watch includes a pulse piece that lifts the hammers away from the bell. The resulting action can be felt without the bell being heard. This tactile arrangement turns a usually audible performance into private information, demonstrating that a complication's output can be touch rather than sight or sound.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "24-hour", "title": "24-hour display", "family": "Displays", "kind": "Display variant", "aliases": [ "24-hour dial" ], "purpose": "Read the hour without a separate AM/PM interpretation.", "mechanism": "The hour indication is read against 24 hours rather than a conventional 12-hour dial.", "history": { "date": "Documented modern example; original origin unresolved", "who": "Patek Philippe", "account": "Reference 5224R is a verified modern combination of a 24-hour display and Travel Time. The current official product page does not establish the display’s original inventor.", "status": "Origin unresolved" }, "fact": "Its solid hour hand indicates local time; the skeletonized hour hand shows home time.", "sources": [ { "title": "Patek Philippe 5224R 24-hour display", "url": "https://www.patek.com/en/collection/complications/5224R-001", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A whole day in one revolution", "account": "Patek's Reference 5224R puts local and home time on a twenty-four-hour display. Its solid and skeletonized hands distinguish the two readings. The larger hour cycle removes the ordinary twelve-hour ambiguity, while the paired hands show that a different display format can also carry travel information.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "jumping-seconds", "title": "Deadbeat / jumping seconds", "family": "Displays", "kind": "Complication", "aliases": [ "true seconds", "seconde morte" ], "purpose": "Make individual seconds easier to read on a mechanical watch.", "mechanism": "The seconds hand advances in sixty distinct steps per minute rather than following every beat of the oscillator.", "history": { "date": "1867 concept; 1877 patent application", "who": "Ferdinand Adolph Lange; Richard and Emil Lange", "account": "Lange attributes its pocket-watch concept to Ferdinand Adolph in 1867 and the above-plate arrangement patent application to his sons ten years later. This is the history of Lange’s design.", "status": "Patent" }, "fact": "The revised layout allowed removal of the seconds mechanism without dismantling the whole movement.", "sources": [ { "title": "Lange jumping seconds mechanism", "url": "https://www.alange-soehne.com/hk-en/manufacture/art-of-watchmaking/jumping-seconds-mechanism", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A mechanical watch counts visibly", "account": "Lange traces its jumping-seconds concept to Ferdinand Adolph Lange in 1867, followed by his sons' later above-plate arrangement. The hand's distinct steps make individual seconds easier to read. The revised construction also made the mechanism removable without dismantling the whole movement, linking legibility on the dial to access at the bench.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "fluidic-hours", "title": "Fluidic hour indication", "family": "Displays", "kind": "Display variant", "aliases": [ "liquid time", "retrograde fluidic hours" ], "purpose": "Represent the passing hours with liquid rather than a traditional hand.", "mechanism": "A mechanical movement drives a patented fluidic module; the boundary between two liquids marks the hour and returns for the next cycle.", "history": { "date": "2012", "who": "HYT; Preciflex", "account": "HYT documents introducing its patented fluidic wristwatch in 2012 and identifies Preciflex as the developer and manufacturer of the fluid technology.", "status": "Maker milestone" }, "fact": "The colored liquid returns at the end of a twelve-hour cycle.", "sources": [ { "title": "HYT official history", "url": "https://www.hytwatches.com/en/about-us.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "HYT fluidic watchmaking", "url": "https://www.hytwatches.com/en/watchmaking.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Time drawn with liquid", "account": "HYT introduced its patented fluidic wristwatch in 2012 using technology developed and manufactured by Preciflex. Liquid marks the passing hours, then returns after a twelve-hour cycle. The fascination comes from a change of medium: an hour indication that normally belongs to a rotating hand becomes a moving liquid boundary.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "jumping-hours", "title": "Jumping hours", "family": "Displays", "kind": "Display variant", "aliases": [ "jump hour", "heures sautantes" ], "purpose": "Show an abruptly changing hour numeral.", "mechanism": "The hour numeral jumps at the hour boundary.", "history": { "date": "1824; 1996 example", "who": "Vacheron Constantin", "account": "Vacheron dates jumping hours to 1824 and its Saltarello to 1996; inventor unresolved.", "status": "Documented example" }, "fact": "Saltarello pairs this with retrograde minutes.", "sources": [ { "title": "Vacheron Constantin historical timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The hour arrives all at once", "account": "Vacheron Constantin dates jumping-hour history to 1824 and its Saltarello to 1996. Instead of creeping between hour marks, the numeral changes abruptly at the boundary. Saltarello pairs that jump with retrograde minutes, turning the ordinary passage into a coordinated change of two very different displays.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "mechanical-digital", "title": "Mechanical digital time", "family": "Displays", "kind": "Display variant", "aliases": [ "jumping numerals", "digital mechanical" ], "purpose": "Read mechanical time directly as numbers.", "mechanism": "Numbered discs advance to present the hours and minutes through apertures; the display does not require an electronic screen.", "history": { "date": "2009", "who": "A. Lange & Söhne", "account": "Lange introduced ZEITWERK in 2009. This is a brand milestone, not a claim that no earlier mechanical digital watch existed.", "status": "Maker milestone" }, "fact": "At the hour boundary, all three numeral discs advance together.", "sources": [ { "title": "Lange: The new ZEITWERK", "url": "https://press.alange-soehne.com/the-new-zeitwerk/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Lange jumping numerals mechanism", "url": "https://www.alange-soehne.com/kr-en/manufacture/art-of-watchmaking/jumping-numerals-mechanism", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Numbers without electronics", "account": "Lange's 2009 ZEITWERK displays time through jumping numeral discs. At the hour boundary, all three advance together. The term digital describes what the wearer reads, not an electronic movement: the dramatic change is still arranged through mechanical parts and stored energy.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "mysterious-display", "title": "Mysterious / floating-hands display", "family": "Displays", "kind": "Display variant", "aliases": [ "mystery dial", "floating hands" ], "purpose": "Create the illusion of hands moving without a visible connection to the mechanism.", "mechanism": "The visible time display conceals its driving connection. Specific architectures differ; the linked museum account documents transparent-dial clocks.", "history": { "date": "1912: Cartier Model A clock", "who": "Maurice Couët and Louis Cartier; inspiration from Jean-Eugène Robert-Houdin", "account": "The Thyssen-Bornemisza exhibition documents Couët’s first Model A for Cartier in 1912, inspired by earlier illusionist-clockmaker work. This is clock ancestry, not a first-watch claim.", "status": "Documented example" }, "fact": "Couët later developed a central-axle version in 1920.", "sources": [ { "title": "Thyssen-Bornemisza Museum: the art of Cartier", "url": "https://static.museothyssen.org/microsites/exposiciones/2012/cartier/tiempo_en.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Cartier: mysterious-hour skeleton wristwatch", "url": "https://www.cartier.com/en-sg/watches/collections/ronde-and-rotonde-de-cartier/rotonde-de-cartier-watch-CRHPI01340", "supports": [ "purpose", "mechanism", "story" ] } ], "story": { "heading": "The hands seem to lose their support", "account": "Maurice Couët's 1912 Model A for Cartier belongs to the clock ancestry of mysterious displays, inspired by earlier illusionist-clockmaker work. A later central-axle arrangement followed in 1920. These displays make the drive visually elusive, turning a necessary mechanism into a puzzle rather than removing the mechanism itself.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "regulator-display", "title": "Regulator display", "family": "Displays", "kind": "Display variant", "aliases": [ "regulateur", "régulateur" ], "purpose": "Separate the time indications for clear reading.", "mechanism": "Hours, minutes and seconds use separate displays rather than sharing a central axis.", "history": { "date": "1987: Régulateur wristwatch", "who": "Gerd-Rüdiger Lang / Chronoswiss", "account": "Chronoswiss introduced its Régulateur in 1987, inspired by earlier regulator clocks used by watchmakers. This is a wristwatch milestone.", "status": "Maker milestone" }, "fact": "The documented Regulator Manufacture has central minutes, hours at 12 and seconds at 6.", "sources": [ { "title": "Chronoswiss company history", "url": "https://chronoswiss.com/en/company", "supports": [ "purpose", "mechanism", "history", "story" ] }, { "title": "Chronoswiss Regulator Manufacture", "url": "https://chronoswiss.com/en/intl/product/regulator-manufacture-ch-1241-1r", "supports": [ "mechanism", "fact", "story" ] } ], "story": { "heading": "A watchmaker's reference becomes a wristwatch", "account": "Chronoswiss introduced its Régulateur in 1987 with inspiration from earlier regulator clocks used by watchmakers. Separate hours, minutes and seconds give each reading its own space. The format's appeal is a different hierarchy of information: the minute hand can become the main character instead of sharing its stage with the hours.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "retrograde", "title": "Retrograde display", "family": "Displays", "kind": "Display variant", "aliases": [ "flyback indication" ], "purpose": "Use a short arc to display a recurring scale such as minutes or dates.", "mechanism": "The indicator travels to the end of its scale and returns to the beginning to start the next cycle.", "history": { "date": "1996", "who": "Vacheron Constantin", "account": "Vacheron documents Saltarello’s retrograde minutes; original inventor unresolved.", "status": "Documented example" }, "fact": "URWERK’s UR-210 minute hand returns in less than 0.1 seconds using a spring and a double star-shaped cam.", "sources": [ { "title": "Vacheron Constantin historical timeline", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "history", "story" ] }, { "title": "URWERK UR-210 technical description", "url": "https://www.urwerk.com/collections/historical-pieces/ur-210", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "A hand with a return journey", "account": "Vacheron's Saltarello documents retrograde minutes; URWERK's UR-210 gives the return its own drama, sending the minute hand back in less than a tenth of a second. The recurring scale is an arc rather than a full circle. Completing the cycle therefore requires a visible return to the beginning.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "satellite-hours", "title": "Satellite hours", "family": "Displays", "kind": "Display variant", "aliases": [ "revolving satellites" ], "purpose": "Present wandering hours through rotating numbered satellites.", "mechanism": "A carousel carries satellites bearing hour numerals; the active numeral crosses the minute indication.", "history": { "date": "Documented modern example; original subtype origin unresolved", "who": "URWERK", "account": "The official UR-105 description documents this particular satellite mechanism. It should not be presented as the origin of all wandering-hour displays.", "status": "Documented example" }, "fact": "Four satellites carrying three numerals apiece provide the twelve hours.", "sources": [ { "title": "URWERK UR-105 technical description", "url": "https://www.urwerk.com/collections/historical-pieces/ur-105", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Four small travellers share twelve hours", "account": "URWERK's UR-105 uses four satellites carrying three numerals each. The active hour travels past the minute scale while the other numerals wait their turn. Its futuristic appearance rests on a much older wandering-hour idea, demonstrating how a historical reading principle can acquire a distinctly modern mechanism and silhouette.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "wandering-hours", "title": "Wandering hours", "family": "Displays", "kind": "Display variant", "aliases": [ "wandering hour" ], "purpose": "Read minutes from the position of a travelling hour numeral.", "mechanism": "Successive hour numerals move along a minute scale, so one numeral supplies both the hour and a pointer to the minutes.", "history": { "date": "Mid-17th century", "who": "The Campani brothers", "account": "URWERK credits the Campani brothers’ clocks for the pope with the historical wandering-hour idea. The source gives a period rather than an exact invention date.", "status": "Documented example" }, "fact": "This display predates modern wristwatches by centuries.", "sources": [ { "title": "URWERK: A new take on time", "url": "https://www.urwerk.com/sites/default/files/inline-files/urwerk-episode2.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "An old clock idea with a futuristic afterlife", "account": "URWERK credits the Campani brothers' seventeenth-century clocks for the pope with the historical wandering-hour idea. A travelling numeral identifies the hour and points to the minutes. Modern wristwatches can make it look like science fiction, but the reading principle reaches back centuries before the wristwatch.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "asthmometer", "title": "Asthmometer", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "Respiration scale", "Asthmometric scale" ], "purpose": "Convert a timed breathing count into respirations per minute.", "mechanism": "A calibrated dial is read after the prescribed number of respirations, commonly fifteen.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted source", "account": "FHH documents the operating method but does not identify an original inventor or establish the date of the first respiration-scale watch.", "status": "Origin unresolved" }, "fact": "The scale's reading depends on counting the number of respirations printed in its calibration.", "sources": [ { "title": "FHH — Asthmometer", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/asthmometer", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "Counting breaths with a timing scale", "account": "An asthmometer converts the time required for a prescribed number of respirations into a rate. Its scale only works when the wearer counts the number for which it was calibrated. The story is an economical use of a chronograph: a printed scale turns elapsed time into another kind of information.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "slide-rule", "title": "Circular slide-rule bezel", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "flight computer", "logarithmic bezel" ], "purpose": "Perform multiplication, division and flight-related calculations on the wrist.", "mechanism": "Rotating logarithmic scales relate values for calculations without adding a separate timing movement.", "history": { "date": "1952", "who": "Willy Breitling", "account": "Breitling documents adapting its 1940s Chronomat slide rule for AOPA’s Navitimer in 1952. This dates the aviation implementation, not the invention of slide rules.", "status": "Maker milestone" }, "fact": "The original AOPA-only Navitimer lacked the Breitling name; public distribution began in late 1955.", "sources": [ { "title": "Breitling official Navitimer history", "url": "https://www.breitling.com/us-en/about/icons/navitimer/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A calculating tool for the cockpit", "account": "Breitling adapted its earlier Chronomat slide rule for AOPA's Navitimer in 1952. The initial AOPA-only version lacked Breitling's name, before public distribution began in late 1955. Rotating scales made calculations available on the wrist, giving the watch a job beyond reading or timing a moment.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "compass-dial", "title": "Compass / orienteering dial", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "sun compass", "navigation bezel" ], "purpose": "Estimate compass directions using the sun and a known local time.", "mechanism": "On RM 60-01, the UTC hand is directed toward the sun and the bezel aligned with local time so its cardinal points indicate directions.", "history": { "date": "2014", "who": "Richard Mille", "account": "The official RM 60-01 archive dates this navigation implementation to 2014. It is a sun-and-time technique rather than a claim of an internal magnetic compass.", "status": "Documented example" }, "fact": "Richard Mille specifies use in both the northern and southern hemispheres.", "sources": [ { "title": "Richard Mille RM 60-01 navigation", "url": "https://www.richardmille.com/historical-models/rm-60-01-automatic-winding-flyback-chronograph-regatta", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Navigation through time and sunlight", "account": "Richard Mille's 2014 RM 60-01 uses a sun-and-time method with a directional bezel. It is a navigation scale rather than a hidden magnetic compass. The distinction is essential to its story: the wearer supplies orientation and the appropriate time reference, while the dial helps translate them into a direction.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "countdown-timer", "title": "Countdown timer", "family": "Practical tools", "kind": "Complication", "aliases": [ "Reverse timer", "Time-remaining display" ], "purpose": "Show how much time remains before a selected deadline.", "mechanism": "A counter decreases toward zero instead of simply accumulating elapsed time.", "history": { "date": "2007 documented example", "who": "Rolex", "account": "The Yacht-Master II introduced in 2007 provides a documented mechanical programmable implementation. The source does not establish the original inventor of all countdown timers.", "status": "Documented example" }, "fact": "Its countdown has mechanical memory and can be synchronized while it is running.", "sources": [ { "title": "Rolex — Yacht-Master II history and countdown", "url": "https://newsroom.rolex.com/watches/new-watches/yacht-master-ii", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The important number is how much remains", "account": "Rolex's 2007 Yacht-Master II documents a programmable mechanical countdown with memory and synchronization while running. A countdown reverses the ordinary elapsed-time question. Rather than asking how long an event has lasted, the wearer watches the time left before an intended moment.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "depth-gauge", "title": "Depth gauge", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "diving depth", "pressure depth" ], "purpose": "Measure depth during a dive.", "mechanism": "Implementations differ: Oris allows water into a channel in the crystal, where the air–water boundary corresponds to a depth scale.", "history": { "date": "1968 milestone; 2013 Oris example", "who": "Favre Leuba; Oris", "account": "Favre Leuba documents Bathy in 1968. Oris’s anniversary brochure identifies its Aquis Depth Gauge as a 2013 development.", "status": "Documented example" }, "fact": "The Oris measuring channel lies in the crystal; the description does not mean the movement is flooded.", "sources": [ { "title": "Favre Leuba official history", "url": "https://www.favreleuba.com/history", "supports": [ "history", "story" ] }, { "title": "Oris Aquis Depth Gauge", "url": "https://www.oris.ch/en-DE/product/watch/aquis/aquis-depth-gauge/01-733-7755-4154-Set-MB", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Oris 110 years brochure", "url": "https://backoffice.oris.ch/data/14584_110yearsbrochure.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Letting water reveal depth without flooding the movement", "account": "Favre Leuba's 1968 Bathy and Oris's 2013 Aquis Depth Gauge document different implementations of depth measurement. In the Oris construction the measuring channel is in the crystal. That detail is part of the fascination: the watch can use a water-and-air interaction without implying that water enters its movement.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "function-selector", "title": "Function-selector indication", "family": "Practical tools", "kind": "Complication", "aliases": [ "crown mode indicator" ], "purpose": "Show whether the crown is winding, neutral or setting the hands.", "mechanism": "A push-button in the crown selects its function; a dial indication reports the selected mode.", "history": { "date": "2001", "who": "Richard Mille", "account": "Richard Mille documents the RM 002-V1 in 2001 and describes its function selector as a first. The securely supported milestone is that model’s introduction.", "status": "Maker milestone" }, "fact": "The RM 21-02 uses a hand at 4 o’clock to identify the active mode.", "sources": [ { "title": "Richard Mille RM 002-V1, 2001", "url": "https://www.richardmille.com/historical-models/rm-002-v1-tourbillon", "supports": [ "history", "story" ] }, { "title": "Richard Mille RM 21-02 technical description", "url": "https://www.richardmille.com/collections/rm-21-02-tourbillon-aerodyne", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The crown tells you what it is doing", "account": "Richard Mille's RM 002-V1 archive documents a function selector in 2001. A later RM 21-02 uses a hand to show winding, neutral or hand-setting mode. The indication translates an internal control state into something visible, helping the owner understand an operation otherwise communicated only by the crown's position.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "maximum-depth", "title": "Maximum-depth memory", "family": "Practical tools", "kind": "Complication", "aliases": [ "memo depth", "maximum depth indicator" ], "purpose": "Retain the deepest point of a dive while also showing current depth.", "mechanism": "IWC’s pressure converter transmits a spring membrane’s motion through levers; a pawl prevents the maximum-depth indicator from returning.", "history": { "date": "Verified modern implementation; original origin unresolved", "who": "IWC Schaffhausen", "account": "IWC’s official complication description explains this mechanism without establishing its original inventor or invention date.", "status": "Origin unresolved" }, "fact": "The blue indicator follows current depth; the red indicator retains the maximum and can be reset with a pusher.", "sources": [ { "title": "IWC depth gauge mechanism", "url": "https://www.iwc.com/au-en/complications/depth-gauge", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A dive leaves a memory", "account": "IWC's documented arrangement uses a blue indicator for current depth and a red one for the deepest point, reset by a pusher. The live reading changes as the diver moves, while the second indicator preserves an event. Two pointers therefore answer two distinct questions: where am I, and how far did I go?", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "altimeter", "title": "Mechanical altimeter", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "barometric altitude" ], "purpose": "Estimate altitude from atmospheric pressure after setting a reference.", "mechanism": "A barometric altimeter converts pressure readings into an altitude indication; calibration and weather affect the result.", "history": { "date": "1962 documented example", "who": "Favre Leuba", "account": "The manufacturer dates Bivouac to 1962 and documents its aneroid barometer for altitude and air-pressure readings.", "status": "Maker milestone" }, "fact": "In a pressurized airliner, a barometric altimeter responds to cabin pressure rather than directly measuring the aircraft’s true altitude.", "sources": [ { "title": "Favre Leuba official history", "url": "https://www.favreleuba.com/history", "supports": [ "history", "story" ] }, { "title": "Oris: How does an altimeter work?", "url": "https://helpcenter.oris.ch/hc/en-gb/articles/38677843357713-How-does-an-Altimeter-work", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A height reading built from pressure", "account": "Favre Leuba's 1962 Bivouac used an aneroid barometer for altitude and pressure information. Its interpretation depends on a reference and the surrounding air pressure. In a pressurized aircraft, that means cabin pressure rather than direct knowledge of true aircraft height; understanding the mechanism is part of understanding the reading.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "barometer", "title": "Mechanical barometer", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "aneroid barometer" ], "purpose": "Show atmospheric pressure for environmental observation or altitude interpretation.", "mechanism": "An aneroid barometer provides a mechanical pressure indication. Its altitude and pressure readings are related functions, not two unrelated sensors.", "history": { "date": "1962 documented example", "who": "Favre Leuba", "account": "Favre Leuba documents the Bivouac’s barometer in 1962. The date identifies this wristwatch implementation rather than the invention of barometers.", "status": "Maker milestone" }, "fact": "The Swiss national parachuting team wore Bivouac during the 1962 World Cup in the United States.", "sources": [ { "title": "Favre Leuba official history", "url": "https://www.favreleuba.com/history", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The atmosphere enters the watch story", "account": "Favre Leuba documents its Bivouac barometer in 1962, when the Swiss national parachuting team wore the watch at the World Cup in the United States. The anecdote connects a pressure-sensitive instrument to an outdoor setting. It is a wristwatch milestone, not the invention of atmospheric-pressure measurement.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "g-force", "title": "Mechanical G-force indication", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "G-sensor", "acceleration indication" ], "purpose": "Provide feedback about acceleration during a golfer’s swing.", "mechanism": "A patented mechanical sensor records the swing’s acceleration and is reset with a pusher for the next measurement.", "history": { "date": "2014", "who": "Richard Mille", "account": "The official RM 38-01 archive dates its Bubba Watson G-sensor watch to 2014, following the earlier RM 038 in 2011.", "status": "Maker milestone" }, "fact": "The sensor contains over fifty moving parts within 17 mm and records acceleration up to 20 G.", "sources": [ { "title": "Richard Mille RM 38-01 G-sensor", "url": "https://www.richardmille.com/historical-models/rm-38-01-tourbillon-bubba-watson", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A golfer's swing becomes a mechanical reading", "account": "Richard Mille's 2014 RM 38-01 for Bubba Watson includes a G-sensor with more than fifty moving parts in a seventeen-millimetre assembly. It records acceleration up to twenty G. The watch takes a brief sporting action and gives it a separate mechanical indication, well outside the usual calendar or timezone functions.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "golf-counter", "title": "Mechanical golf counter", "family": "Practical tools", "kind": "Complication", "aliases": [ "stroke counter", "golf score" ], "purpose": "Keep track of strokes, holes and the total score during a golf game.", "mechanism": "Jaermann & Stübi documents a patented mechanical counter with separate counting works, plus a rotating bezel for handicap comparison.", "history": { "date": "Verified WO1 example; exact original patent date unresolved", "who": "Jaermann & Stübi", "account": "The manufacturer identifies its patented golf-counter complication in the Ian Woosnam WO1. The selected official source does not supply its original patent date.", "status": "Documented example" }, "fact": "The seventy-two WO1 cases were made using metal from Woosnam’s Masters-winning irons.", "sources": [ { "title": "Jaermann & Stübi Ian Woosnam WO1", "url": "https://jaermann-stuebi.ch/en/collection/wo1/wo1.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The scorecard becomes part of the watch", "account": "Jaermann & Stübi's Ian Woosnam WO1 tracks strokes, holes and total score. Its seventy-two cases used metal from Woosnam's Masters-winning irons. The connection is unusually tangible: a watch about recording a round was made with material carrying a documented link to a golfer's equipment.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "thermometer", "title": "Mechanical thermometer", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "TMT", "temperature indication" ], "purpose": "Provide a temperature indication on a mechanical watch.", "mechanism": "BALL documents a patented mechanical thermometric indication. Its owner’s manual explains that the reading represents the temperature inside the case.", "history": { "date": "Verified modern implementation; original origin unresolved", "who": "BALL Watch Company", "account": "The Roadmaster TMT is a documented modern example. The selected manufacturer sources do not establish a universal inventor or invention year.", "status": "Origin unresolved" }, "fact": "The Celsius model spans −35 to 45°C, and the wearer’s wrist can influence the reading.", "sources": [ { "title": "BALL Roadmaster TMT Celsius", "url": "https://www.ballwatch.com/en/DT3030B-S4-BEC", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "BALL official owner manual", "url": "https://www.ballwatch.co.jp/common/pdf/ballwatch_usermanual.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "An instrument affected by its own wearer", "account": "Ball's Roadmaster TMT gives a mechanical temperature reading, with the documented Celsius version spanning minus thirty-five to forty-five degrees. The wearer's wrist can influence what it shows. This makes the complication an instructive example of context: a measurement on the wrist is not automatically the temperature of the surrounding air.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "power-reserve", "title": "Power-reserve indication", "family": "Practical tools", "kind": "Complication", "aliases": [ "reserve de marche", "running reserve" ], "purpose": "Show how long the mechanical watch can continue before winding.", "mechanism": "An additional indicator reports the movement’s remaining energy as running time.", "history": { "date": "1951 documented wristwatch example", "who": "Jaeger-LeCoultre", "account": "The manufacturer dates Futurematic to 1951 and documents its power-reserve counter. This is a verified example rather than the invention date of the general complication.", "status": "Documented example" }, "fact": "Futurematic balances its reserve counter at 9 o’clock with small seconds at 3 o’clock.", "sources": [ { "title": "Jaeger-LeCoultre Futurematic", "url": "https://www.jaeger-lecoultre.com/gb-en/watches/collectibles/qve50000", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Seeing the energy left inside", "account": "Jaeger-LeCoultre's 1951 Futurematic paired a power-reserve counter at nine o'clock with small seconds at three. A reserve indication makes stored running time visible, turning winding from a guess into an informed decision. It reports something about the watch itself rather than the world outside the case.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "productometer", "title": "Productometer", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "Production-rate scale" ], "purpose": "Convert the time needed to produce one item into a production rate per hour.", "mechanism": "A chronograph times a unit of production and its scale converts the interval to hourly output.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted source", "account": "FHH records the scale's purpose without identifying its original inventor or first watch.", "status": "Origin unresolved" }, "fact": "The definition specifies items that take no more than sixty seconds each to make.", "sources": [ { "title": "FHH — Scale", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/scale", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "A chronograph visits the workshop floor", "account": "FHH describes a productometer for items that take no more than sixty seconds apiece to make. Timing a production interval allows the scale to express an hourly rate. It is a reminder that specialised watch scales can address work and output, alongside the more familiar racing and aviation associations.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "pulsometer", "title": "Pulsometer", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "Pulsometric scale", "Pulse scale" ], "purpose": "Convert a timed count of heartbeats into beats per minute.", "mechanism": "Stop the chronograph after the number of beats specified by its dial calibration and read the corresponding rate.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "FHH defines the scale and Longines documents a modern Pulsometer Chronograph. Neither consulted page establishes a universal first inventor.", "status": "Origin unresolved" }, "fact": "Common calibrations use fifteen, twenty or thirty heartbeats.", "sources": [ { "title": "FHH — Scale", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/scale", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Longines — Pulsometer Chronograph", "url": "https://mediacenter.longines.com/the-longines-pulsometer-chronograph/", "supports": [ "history", "story" ] } ], "story": { "heading": "The dial does part of the counting", "account": "A pulsometer combines timed heartbeats with a calibrated scale to express a rate. Common versions count fifteen, twenty or thirty beats, so the calibration matters as much as the hand. The complication's story is a translation: elapsed seconds become a pulse reading through a known count and a printed relationship.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "regatta-countdown", "title": "Regatta countdown", "family": "Practical tools", "kind": "Complication", "aliases": [ "Yacht timer", "Regatta chronograph" ], "purpose": "Follow the preparatory sequence before the start of a sailing race.", "mechanism": "A countdown recorder divides the start interval into visible stages, often marked with distinct colors.", "history": { "date": "1968 documented example", "who": "Heuer", "account": "Heuer's Skipper appeared in 1968. TAG Heuer's historical account describes its fifteen-minute recorder; this is a documented yacht-timing design rather than proof of the first yacht timer ever made.", "status": "Documented example" }, "fact": "Three colored five-minute sectors identify stages within the fifteen-minute interval.", "sources": [ { "title": "TAG Heuer — Evolution of yacht timers", "url": "https://magazine.tagheuer.com/en/2023/07/19/sea-change-the-evolution-of-yacht-timers/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Colour gives the start sequence a shape", "account": "Heuer's 1968 Skipper divided its fifteen-minute recorder into three coloured five-minute sectors. The display made stages within an interval visually distinct. A regatta timer belongs to the anticipation before the start as much as the race itself, organizing remaining time around a sporting sequence.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "service-indicator", "title": "Service / running-time indication", "family": "Practical tools", "kind": "Complication", "aliases": [ "oil change indicator", "elapsed operating time" ], "purpose": "Track movement operation and provide a servicing reminder.", "mechanism": "Long-term indications are driven by the movement’s operation, rather than simply following calendar dates.", "history": { "date": "Documented UR-1001 example", "who": "URWERK", "account": "UR-1001’s official technical description documents separate service and running-time indications. It is a verified implementation, not a claim about their original inventor.", "status": "Documented example" }, "fact": "Its displays include a five-year service indicator, a hundred-year counter and a thousand-year linear scale.", "sources": [ { "title": "URWERK UR-1001 technical description", "url": "https://urwerk.com/collections/ur-special-projects/ur-1001", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "URWERK UR-1001 official press release", "url": "https://www.urwerk.com/sites/default/files/press/docs/ur-1001_eng_1.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The watch records its own working life", "account": "URWERK's UR-1001 includes a five-year service indication, a hundred-year counter and a thousand-year linear scale. These displays turn operating duration into a visible subject. The story goes beyond a reminder: a watch normally reads the present, while these indications invite its owner to consider the mechanism's accumulated life.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "tachymeter", "title": "Tachymeter", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "Tachymetric scale" ], "purpose": "Read speed from the time taken to travel a known distance.", "mechanism": "Graduations convert the chronograph's elapsed-time reading into units of distance per hour.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "The consulted sources define the scale without establishing its original inventor. Omega's Chronoscope is a documented modern example drawing on its 1940s chronographs.", "status": "Origin unresolved" }, "fact": "A tachymeter is a calculation scale; the chronograph supplies the actual timing mechanism.", "sources": [ { "title": "FHH — Scale", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/scale", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Omega — Speedmaster Chronoscope", "url": "https://www.omegawatches.com.hk/en-hk/watches/speedmaster/two-counters/chronoscope/product", "supports": [ "history", "story" ] } ], "story": { "heading": "Speed hides in an elapsed second", "account": "A tachymeter scale translates a timed interval over a known distance into a rate. Omega's Chronoscope documents a modern version drawing on its earlier chronographs. The printed scale is not itself the timer: the chronograph measures the interval, while the tachymeter supplies the relationship needed to interpret it.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "telemeter", "title": "Telemeter", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "Telemetric scale" ], "purpose": "Estimate distance to an event that can first be seen and then heard.", "mechanism": "The chronograph times the light-to-sound delay; the scale converts that delay using the travel speed of sound through air.", "history": { "date": "Original date unresolved", "who": "No sole inventor established by the consulted sources", "account": "The source defines its physical principle, not a definitive inventor or first watch.", "status": "Origin unresolved" }, "fact": "FHH gives approximately 340 metres per second as the sound-speed basis; lightning and thunder illustrate the use.", "sources": [ { "title": "FHH — Scale", "url": "https://www.hautehorlogerie.org/en/watches-and-culture/watchmaking-knowledge/encyclopedia/scale", "supports": [ "purpose", "mechanism", "fact", "story" ] }, { "title": "Omega — Speedmaster Chronoscope", "url": "https://www.omegawatches.com.hk/en-hk/watches/speedmaster/two-counters/chronoscope/product", "supports": [ "purpose" ] } ], "story": { "heading": "Lightning supplies one signal, thunder the other", "account": "A telemeter uses the delay between seeing an event and hearing it to estimate distance from the speed of sound. FHH uses lightning and thunder to illustrate the idea. This turns a chronograph into a distance tool, provided the event and conditions suit the assumption behind the scale.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "tide-bezel", "title": "Tide bezel", "family": "Practical tools", "kind": "Scale or tool", "aliases": [ "tidal cycle bezel" ], "purpose": "Read the relative tidal cycle after consulting the appropriate local tide table.", "mechanism": "An adjustable tide bezel relates known high-tide times to the current time; it is a manually set scale rather than a universal automatic tide prediction.", "history": { "date": "Verified modern example; original origin unresolved", "who": "Sinn Spezialuhren", "account": "Sinn’s 240 St GZ documents this practical scale. The selected official information does not establish its original inventor or a first-watch claim.", "status": "Origin unresolved" }, "fact": "Sinn describes reading relative water level and the time until the next high tide.", "sources": [ { "title": "Sinn 240 St GZ product sheet", "url": "https://www.sinn.de/out/media/Sinn_SD_240StGZ_EN.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Sinn 240 user manual", "url": "https://www.sinn.de/out/media/Sinn_B_240_EN.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A local tide table becomes a wrist reference", "account": "Sinn's 240 St GZ uses a tidal scale set with reference to an appropriate local tide table. The wearer can then read relative water level and time until the next high tide. Its usefulness depends on that local setup; the bezel does not independently know every coastline's tide schedule.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "torque-indicator", "title": "Torque indication", "family": "Practical tools", "kind": "Complication", "aliases": [ "mainspring tension" ], "purpose": "Report spring tension in addition to the time remaining before winding.", "mechanism": "An indicator supplies information about the mainspring’s tension, helping identify the movement’s specified operating range.", "history": { "date": "2001 documented example", "who": "Richard Mille", "account": "The official RM 002-V1 archive documents a torque indication in 2001. It does not resolve the universal origin of torque displays.", "status": "Documented example" }, "fact": "For RM 21-02, Richard Mille specifies 5.3–6.5 N.mm as its relevant reference range; those figures are model-specific.", "sources": [ { "title": "Richard Mille RM 002-V1, 2001", "url": "https://www.richardmille.com/historical-models/rm-002-v1-tourbillon", "supports": [ "history", "story" ] }, { "title": "Richard Mille RM 21-02 technical description", "url": "https://www.richardmille.com/collections/rm-21-02-tourbillon-aerodyne", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "How much energy is not the whole question", "account": "Richard Mille's RM 002-V1 documents torque indication in 2001. A reserve display describes time remaining; a torque display adds information about spring tension. Model-specific reference ranges, such as those published for RM 21-02, remind the wearer that this is an indication interpreted within a particular movement's design.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "winding-efficiency", "title": "Winding-efficiency indication", "family": "Practical tools", "kind": "Complication", "aliases": [ "energy balance" ], "purpose": "Show whether the wearer is replenishing the mainspring faster than the watch consumes energy.", "mechanism": "The indication compares energy generated with energy consumed over a defined interval.", "history": { "date": "2012", "who": "URWERK", "account": "The UR-210 press release dated September 2012 documents this winding-efficiency complication. URWERK describes it as a new development of its own.", "status": "Maker milestone" }, "fact": "Its comparison covers the previous two hours; the green zone means the mainspring is being replenished.", "sources": [ { "title": "URWERK UR-210 technical description", "url": "https://www.urwerk.com/collections/historical-pieces/ur-210", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "URWERK UR-210 September 2012 press release", "url": "https://www.urwerk.com/sites/default/files/press/docs/ur210_eng.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Is your day feeding the watch?", "account": "URWERK's 2012 UR-210 compares winding input with energy use over the previous two hours. A green reading means the mainspring is being replenished. This is different from simply showing reserve: the indication turns the wearer's recent activity and the watch's consumption into a visible balance.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "automaton-watch", "title": "Automaton watch", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "Animated mechanical scene", "Automata watch", "animated figures", "automata" ], "purpose": "Animate figures or a scene mechanically, sometimes synchronized with striking.", "mechanism": "Cams and linked mechanisms control the movement of miniature figures and scenery.", "history": { "date": "18 October 2012 documented example", "who": "Jaquet Droz", "account": "The original Bird Repeater release documents a cam-driven animated scene linked to minute repetition. The brand's earlier automata heritage should not be presented as proof of the original inventor of every automaton watch.", "status": "Documented example" }, "fact": "Eight synchronized animations include feeding birds, spreading wings, flowing water and an egg opening to reveal a chick.", "sources": [ { "title": "Jaquet Droz — Original Bird Repeater release, 2012", "url": "https://www.jaquet-droz.com/en/news/the-bird-repeater", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Jaquet Droz Bird Repeater Openwork history", "url": "https://www.jaquet-droz.com/en/node/3531", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The minute repeater opens a miniature theatre", "account": "Jaquet Droz's 2012 Bird Repeater links a cam-driven scene to minute repetition. Its eight coordinated animations include birds feeding, wings spreading, flowing water and an egg opening. The time signal becomes an occasion for movement, connecting a functional complication with a small mechanical performance.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "mechanical-cards", "title": "Mechanical card games", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "poker", "blackjack", "baccarat" ], "purpose": "Provide a card-game mechanism independent of the watch’s ordinary time display.", "mechanism": "A wound spring spins card-bearing discs; stopping arrangements position cards in apertures, some concealed by controlled shutters.", "history": { "date": "2011 priority; 2014 US grant", "who": "Christophe Claret; Jan Dubois; Alain Schiesser", "account": "US8913467B2 identifies these inventors, a 14 March 2011 priority and a 16 December 2014 grant. It documents this particular mechanism.", "status": "Patent" }, "fact": "The patent explicitly covers blackjack, baccarat and poker variants.", "sources": [ { "title": "US8913467B2: Timepiece with mechanical cards", "url": "https://patents.google.com/patent/US8913467B2/en", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A game dealt by springs and discs", "account": "The documented Claret, Dubois and Schiesser patent describes card-bearing discs, stopping arrangements and shutters, with blackjack, baccarat and poker variants. The ordinary time display remains a separate job. This unusual complication broadens the meaning of a watch mechanism: stored energy can arrange a game as well as measure an interval.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "slot-machine", "title": "Mechanical slot-machine game", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "jackpot mechanism", "slot automaton" ], "purpose": "Recreate a miniature slot-machine draw as a mechanical performance.", "mechanism": "A lever drives a rack that spins three symbol-bearing rollers; stoppers arrest the rollers sequentially while sounding a striking mechanism.", "history": { "date": "Documented in the 2014 patent; original origin unresolved", "who": "Girard-Perregaux", "account": "The mechanical-card patent describes the existing Vintage 1945 Jackpot Tourbillon as prior art. Its model name is not an invention date.", "status": "Documented example" }, "fact": "The patent description identifies three aligned bells as the jackpot combination.", "sources": [ { "title": "US8913467B2 prior-art description", "url": "https://patents.google.com/patent/US8913467B2/en", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Three bells inside a watch", "account": "The mechanical-card patent identifies the Vintage 1945 Jackpot Tourbillon as earlier slot-machine prior art and describes three aligned bells as its jackpot combination. A playful draw and a precision regulator share one object. Its model name should not be mistaken for the invention date of this miniature game.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "musical-watch", "title": "Musical watch / disc music box", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "Music-box watch", "Melody watch" ], "purpose": "Play a mechanical melody on request or as part of an alarm function.", "mechanism": "Pins operate tuned blades; the musical mechanism is distinct from a repeater's encoding of the current time.", "history": { "date": "Documented model; original invention date unresolved", "who": "Breguet, La Musicale 7800 example", "account": "Breguet documents the 7800's disc-based mechanism. This explains a particular modern implementation and does not establish who originally invented all musical watches.", "status": "Documented example" }, "fact": "Its disc successively acts on fifteen blades, and the connected dial rotates during melody playback.", "sources": [ { "title": "Breguet — Classique La Musicale 7800", "url": "https://www.breguet.com/en/watches/classique/classique-la-musicale-7800/7800bb119yv", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A dial joins the melody", "account": "Breguet's reference 7800 uses a disc that acts on fifteen blades, while the connected dial rotates during playback. The sound and the visible performance share a mechanism. It is a particular modern music-box architecture, offering a different route to melody from the pinned cylinders found in other musical watches.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "music-box", "title": "Pinned-cylinder musical watch", "family": "Mechanical theatre", "kind": "Mechanism variant", "aliases": [ "musical watch", "mechanical melody" ], "purpose": "Play a recognizable melody mechanically.", "mechanism": "Pinned cylinders lift the blades of a music comb in a programmed sequence.", "history": { "date": "2022 documented edition", "who": "Jacob & Co.", "account": "The Opera Godfather 50th Anniversary edition documents a modern musical wristwatch. Its date is an edition milestone rather than the invention of musical watches.", "status": "Documented example" }, "fact": "The manufacturer describes 120 individually fitted and adjusted pins on this edition’s musical cylinders.", "sources": [ { "title": "Jacob & Co. Opera Godfather 50th Anniversary", "url": "https://jacobandco.com/news/opera-godfather-50th-anniversary-a-horological-cinematic-and-personal-celebration", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Jacob & Co. Opera Godfather music mechanism", "url": "https://jacobandco.com/timepieces/opera-godfather-baguette/white-gold-baguette", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A familiar tune, encoded in pins", "account": "Jacob & Co.'s Opera Godfather anniversary edition uses musical cylinders carrying 120 individually fitted and adjusted pins. The melody is arranged through physical contacts rather than a recording. That visible idea is the appeal: the tune has a mechanical pattern the maker must build and adjust.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "roulette", "title": "Roulette mechanism", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "casino watch", "roulette automaton" ], "purpose": "Provide a miniature mechanical game of roulette on demand.", "mechanism": "A pusher starts a freely spinning roulette table mounted on ball bearings; a white ceramic ball settles into one of its numbered pockets.", "history": { "date": "Verified modern example; original origin unresolved", "who": "Jacob & Co.", "account": "The manufacturer documents Casino Tourbillon as a working roulette watch. The selected official product description does not establish the original invention of roulette watches.", "status": "Origin unresolved" }, "fact": "Its wheel has thirty-seven pockets: numbers one to thirty-six and a green zero.", "sources": [ { "title": "Jacob & Co. Casino Tourbillon mechanism", "url": "https://jacobandco.com/timepieces/casino-tourbillon/white-gold-malachite-dial", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A casino table reduced to a mechanism", "account": "Jacob & Co.'s Casino Tourbillon gives roulette a mechanical home on the wrist. Its wheel has thirty-seven pockets: one through thirty-six and a green zero. This added function is recreational rather than another time reading, demonstrating how far mechanical theatre can extend the ordinary idea of a watch.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "singing-bird", "title": "Singing-bird automaton", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "birdsong mechanism" ], "purpose": "Animate a miniature bird while producing its mechanical song.", "mechanism": "Jaquet Droz’s Charming Bird uses air compression through three small sapphire tubes; piston speed and air volume regulate the melody.", "history": { "date": "2013 unveiling", "who": "Jaquet Droz", "account": "The manufacturer’s atelier publication dates the public unveiling to its 275th anniversary in 2013. This is a wristwatch milestone, not the origin of singing-bird automata.", "status": "Maker milestone" }, "fact": "The song is produced by compressed air rather than vibrating a conventional music comb.", "sources": [ { "title": "Jaquet Droz atelier publication", "url": "https://www.jaquet-droz.com/sites/default/files/file_en.pdf", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Jaquet Droz Charming Bird mechanism", "url": "https://www.jaquet-droz.com/en/news/the-charming-bird-the-art-nature-its-peak", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The watch breathes a song", "account": "Jaquet Droz unveiled Charming Bird for its 275th anniversary in 2013. Air compression through small sapphire tubes produces its song, with piston speed and air volume shaping the melody. Unlike a music comb struck by pins, this animated bird uses air, bringing a different physical voice to the wrist.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "suspended-time", "title": "Suspended-time display", "family": "Mechanical theatre", "kind": "Complication", "aliases": [ "Le Temps Suspendu", "hidden time" ], "purpose": "Let the wearer temporarily hide the ordinary time display and recall it on demand.", "mechanism": "A pusher parks the hands at 12 o’clock; another command restores the time display.", "history": { "date": "2011", "who": "Hermès", "account": "Hermès documents the launch of Arceau Le Temps Suspendu in 2011. This identifies its named implementation rather than the invention of all concealed-time watches.", "status": "Maker milestone" }, "fact": "The model won the Men’s Watch Prize at the 2011 Grand Prix d’Horlogerie de Genève.", "sources": [ { "title": "Hermès Arceau Le Temps Suspendu", "url": "https://www.hermes.com/uk/en/product/arceau-le-temps-suspendu-watch-42mm-W408083WW00/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A watch that lets you stop looking at time", "account": "Hermès's 2011 Arceau Le Temps Suspendu temporarily hides the ordinary time display and recalls it on demand. The model received the GPHG Men's Watch Prize that year. Its proposition is unusually poetic: instead of supplying more information, a watch can offer the wearer a moment without the usual visible time reading.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "automatic-winding", "title": "Automatic / self-winding mechanism", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "self winding", "rotor", "bumper" ], "purpose": "Replenish the mainspring using movement of the wearer.", "mechanism": "An oscillating weight drives winding gears. John Harwood’s system used limited back-and-forth travel with spring buffers.", "history": { "date": "1924 patent; 1926 Fortis production", "who": "John Harwood; Fortis", "account": "Fortis documents Harwood’s Swiss wristwatch patent and its subsequent production. Earlier self-winding pocket-watch history is outside that priority claim.", "status": "Patent" }, "fact": "Harwood’s bumper mechanism differs from the full-turn rotors familiar in many later automatic watches.", "sources": [ { "title": "Fortis: Harwood automatic history", "url": "https://www.fortis-swiss.com/pages/the-first-automatic-wristwatch", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Your movement winds the movement", "account": "John Harwood's 1924 Swiss wristwatch patent and Fortis's 1926 production document a self-winding milestone. His oscillating weight moved between spring buffers, unlike the full-turn rotor familiar in many later watches. The mechanism turns activity into stored energy, although it does not add a new time indication under the strict functional definition.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "constant-force-blade", "title": "Buckling-blade constant-force escapement", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "silicon blade", "constant force" ], "purpose": "Deliver more consistent impulses despite changing barrel energy.", "mechanism": "Girard-Perregaux uses the elastic, bistable behavior of a buckling silicon blade to regulate the force delivered to the balance.", "history": { "date": "2013", "who": "Girard-Perregaux", "account": "The Constant Escapement L.M. launched in 2013. This is a specific implementation, not the invention of every constant-force mechanism.", "status": "Maker milestone" }, "fact": "That watch won the 2013 GPHG Aiguille d’Or.", "sources": [ { "title": "Girard-Perregaux: Neo Constant Escapement technical description", "url": "https://www.girard-perregaux.com/en-us/watches/bridges/93510-21-1930-5cx", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A tiny blade controls the release", "account": "Girard-Perregaux's 2013 Constant Escapement L.M. used a buckling-blade construction and won that year's GPHG Aiguille d'Or. Its story is energy delivery rather than an extra dial reading. The documented design tackles how force reaches the regulator, illustrating why precision mechanisms belong beside complications even when their purpose is different.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "carrousel", "title": "Carrousel / karussel", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [], "purpose": "Rotate the regulator to average positional rate differences.", "mechanism": "Two power paths drive the rotating platform and the escapement; unlike a conventional tourbillon, this arrangement does not depend on the same fixed-wheel architecture.", "history": { "date": "1892", "who": "Bahne Bonniksen", "account": "Blancpain’s technical history dates the Danish watchmaker’s carrousel patent to 1892. He worked in England.", "status": "Patent" }, "fact": "Blancpain presented a flying one-minute wristwatch carrousel in 2008.", "sources": [ { "title": "Blancpain: tourbillon and carrousel workshop", "url": "https://lettresdubrassus.blancpain.com/de/issue-13/hier-entstehen-die", "supports": [ "history", "mechanism", "story" ] }, { "title": "Blancpain: Le Brassus Tourbillon Carrousel", "url": "https://lettresdubrassus.blancpain.com/en/issue-14/le-brassus", "supports": [ "purpose", "mechanism", "fact", "story" ] } ], "story": { "heading": "Another route to a rotating regulator", "account": "Danish watchmaker Bahne Bonniksen patented the carrousel in 1892 while working in England. Blancpain later presented a flying one-minute wristwatch implementation in 2008. The rotating assembly invites comparison with a tourbillon, but the drive construction is distinct; similar motion on the dial does not make the two mechanisms identical.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "flying-tourbillon", "title": "Flying tourbillon", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [], "purpose": "Provide a rotating regulator with an unobstructed view from above.", "mechanism": "The rotating assembly is supported from one side, eliminating the upper supporting bridge.", "history": { "date": "1920", "who": "Alfred Helwig and his students", "account": "Glashütte Original credits the German Watchmaking School team with developing this one-sided construction in 1920.", "status": "Documented example" }, "fact": "The word “flying” describes the support arrangement; the assembly remains mechanically supported.", "sources": [ { "title": "Glashütte Original: 180 years of watchmaking", "url": "https://www.glashuette-original.com/en/180-years-glashuette-watchmaking/", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Removing the bridge from the view", "account": "Glashütte Original credits the German Watchmaking School team with the one-sided flying construction in 1920. Supporting the rotating assembly from one side changes how the mechanism appears to the viewer. Flying describes this arrangement, not a cage floating unsupported; the impression of openness remains grounded in mechanical support.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "fusee-chain", "title": "Fusée-and-chain transmission", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "fusee", "fusee and chain" ], "purpose": "Compensate for falling mainspring torque as the watch unwinds.", "mechanism": "A chain transfers power through a cone-shaped fusée; the changing effective radius varies the leverage.", "history": { "date": "1994: Lange wristwatch milestone", "who": "Original inventor not established; A. Lange & Söhne modern example", "account": "Lange’s Pour le Mérite wristwatches have used the transmission since 1994. This is a modern application of an older mechanism.", "status": "Maker milestone" }, "fact": "The documented Richard Lange Pour le Mérite chain contains 636 components.", "sources": [ { "title": "Lange: fusée-and-chain transmission", "url": "https://www.alange-soehne.com/ae-en/timepieces/selections/the-fusee-and-chain-transmission", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Richard Lange Pour le Mérite", "url": "https://www.alange-soehne.com/ae-en/timepieces/richard-lange/richard-lange-pour-le-merite", "supports": [ "history", "fact", "story" ] } ], "story": { "heading": "A little chain manages a changing spring", "account": "Lange's Pour le Mérite wristwatches have used a fusée-and-chain transmission since 1994. Its documented Richard Lange chain contains 636 components. The conical transmission addresses changing mainspring force, making this a story about supplying energy more evenly rather than adding another piece of information to the dial.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "multi-axis-tourbillon", "title": "Multi-axis tourbillon", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "Gyrotourbillon", "Spherotourbillon", "double-axis", "triple-axis" ], "purpose": "Change the regulator’s orientation around more than one axis.", "mechanism": "Nested rotating assemblies carry the balance and escapement through multiple spatial orientations.", "history": { "date": "2004", "who": "Jaeger-LeCoultre", "account": "The maison unveiled its double-axis Gyrotourbillon in 2004. This establishes that model’s introduction, rather than universal priority for multi-axis regulators.", "status": "Maker milestone" }, "fact": "Later Gyrotourbillon generations altered the cage architecture and hairspring shape.", "sources": [ { "title": "Jaeger-LeCoultre: Valley of Inventions", "url": "https://www.jaeger-lecoultre.com/us-en/news/watchmaking/valley-of-inventions", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A regulator takes more than one path", "account": "Jaeger-LeCoultre unveiled its double-axis Gyrotourbillon in 2004. Later generations changed the cage and hairspring architecture. The visible performance is compelling, but the engineering story lies in coordinating motion around multiple axes; that maker milestone should not be promoted into a universal origin for every multi-axis regulator.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "remontoir", "title": "Remontoir / remontoire d’égalité", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "constant force", "constant-force" ], "purpose": "Reduce changes in the force reaching the escapement.", "mechanism": "A small secondary spring is recharged at regular intervals and supplies the going train between recharges.", "history": { "date": "Original date not established", "who": "Original inventor not established", "account": "Lange’s documented constant-force constructions explain this principle. Their modern implementations do not establish its original invention.", "status": "Origin unresolved" }, "fact": "The Lange 31 recharges its remontoir every ten seconds.", "sources": [ { "title": "Lange: constant-force escapement", "url": "https://www.alange-soehne.com/tw-en/timepieces/selections/the-constant-force-escapement", "supports": [ "purpose", "mechanism", "story" ] }, { "title": "Lange 31 technical release", "url": "https://press.alange-soehne.com/lange-31/", "supports": [ "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "A small energy store between the big spring and the regulator", "account": "Lange's documented constant-force constructions periodically replenish a small intermediate store. In the Lange 31, the remontoir recharges every ten seconds. The main spring and the regulating system are therefore connected through repeated smaller deliveries, making controlled energy supply part of the watch's rhythm.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "resonance", "title": "Resonance regulators", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [], "purpose": "Encourage two oscillators to settle into coordinated motion.", "mechanism": "Two balances interact through resonance. F.P.Journe’s implementation uses no mechanical transmission between the oscillators.", "history": { "date": "2000", "who": "François-Paul Journe; earlier work by Huygens, Janvier and Breguet", "account": "Journe introduced his own Résonance wristwatch in 2000. The underlying phenomenon and earlier clock applications long predate it.", "status": "Maker milestone" }, "fact": "The 2020 version supplies two gear trains from one barrel and includes a one-second remontoir for each train.", "sources": [ { "title": "F.P.Journe: 20 years of Résonance", "url": "https://www.fpjourne.com/en/event/events/fpjourne-unveils-its-new-chronometre-resonance-celebrating-20-years-resonancer", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Two regulators, one shared conversation", "account": "F.P. Journe introduced his Résonance wristwatch in 2000, applying a phenomenon older than that model. The 2020 version supplies two gear trains from one barrel and gives each a one-second remontoir. Its fascination is interaction between regulating systems, rather than simply adding a second balance for visual symmetry.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "skeletonization", "title": "Skeletonisation / openworked movement", "family": "Precision & craft", "kind": "Related craft", "aliases": [ "skeletonisation", "skeletonization", "openworked", "openwork" ], "purpose": "Reveal a mechanical movement.", "mechanism": "Openworking hollows components while preserving their mechanical reliability.", "history": { "date": "1994 example", "who": "Original inventor unresolved", "account": "Vacheron’s timeline documents openworked movements, without establishing their origin.", "status": "Maker milestone" }, "fact": "Vacheron includes this craft under the broader meaning of complication.", "sources": [ { "title": "Vacheron Constantin: skeletonised mechanisms", "url": "https://www.vacheron-constantin.com/sg/en/maison/timeline.html", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "The hidden work becomes the view", "account": "An openworked movement reveals its architecture by removing material while retaining the structure needed to function. Vacheron includes this craft under a broader use of the word complication. Its story belongs to making and presentation: the wearer sees work normally concealed, without necessarily receiving an additional calendar, timing or astronomical function.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "tourbillon", "title": "Tourbillon", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [], "purpose": "Average positional rate errors in a mechanical watch.", "mechanism": "The balance and escapement rotate in a carriage, changing their orientation while the watch runs.", "history": { "date": "26 June 1801", "who": "Abraham-Louis Breguet", "account": "Breguet patented the rotating regulator to address gravity-related rate differences in vertically carried pocket watches.", "status": "Patent" }, "fact": "A one-minute rotation is common, but Breguet No. 2555 used a four-minute tourbillon.", "sources": [ { "title": "Breguet: the tourbillon", "url": "https://www.breguet.com/en/tourbillon", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] }, { "title": "Breguet: principles of the tourbillon", "url": "https://www.breguet.com/en/magazine-quai-de-l-horloge/272465/principles-tourbillon", "supports": [ "mechanism", "fact", "story" ] } ], "story": { "heading": "A pocket-watch problem becomes a moving sculpture", "account": "Breguet's 1801 patent addressed positional rate differences in vertically carried pocket watches. Putting the balance and escapement in a rotating carriage changes their orientation as the watch runs. The beautiful motion has a practical ancestry; Breguet's four-minute No. 2555 also shows that the familiar one-minute revolution is not a universal rule.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } }, { "id": "zero-reset", "title": "Zero-reset seconds / synchronization", "family": "Precision & craft", "kind": "Related mechanism", "aliases": [ "hacking", "stop seconds", "seconds stop" ], "purpose": "Make precise time setting easier.", "mechanism": "Pulling the crown stops the movement; a lever presses a heart-shaped cam to return the seconds hand to zero.", "history": { "date": "Original date not established", "who": "Original inventor not established; A. Lange & Söhne documented implementation", "account": "Lange publishes the construction of its ZERO-RESET system; that description does not settle the origin of all resetting or stop-seconds mechanisms.", "status": "Origin unresolved" }, "fact": "The 1815 Tourbillon adapts the system to stop the tourbillon during setting.", "sources": [ { "title": "Lange: ZERO-RESET mechanism", "url": "https://www.alange-soehne.com/eu-en/manufacture/art-of-watchmaking/zero-reset-mechanism", "supports": [ "purpose", "mechanism", "history", "fact", "story" ] } ], "story": { "heading": "Setting begins at a clean starting point", "account": "Lange's ZERO-RESET construction returns the seconds indication to zero during setting. The 1815 Tourbillon adapts that idea to stopping the tourbillon itself. The useful story is synchronization: a dramatic regulator still has to let its owner set the time in a controlled, readable way.", "basis": "Narrative interpretation of the documented purpose, mechanism, history and fact; source links below." } } ] }