Sunday, September 20, 2015

Vacheron Constantin Atelier Cabinotiers Reference 57260

Prestigious Swiss watch manufacture Vacheron Constantin presents horological masterpiece Atelier Cabinotiers reference 57260, the most complicated watch ever made. It took eight years by a team of three highly talented master watch makers from the manufacture to conceive this horological marvel. The reference 57260 that boasts two dials and features 57 complications, several of which are entirely new and unique. In the reference number 57260, first two digits indicate the number of complications incorporated in this watch and last three digits reminds us the 260th anniversary of Vacheron Constantin (1755 -2015).

The reference 57260 incorporates significant number of ingenious and important new mechanisms that have never been seen before in horology. Made of solid gold (18 carat white gold), polished with glazed bezels on each side, the elegant and well proportioned case has a three position winding crown with corresponding indication window on the case band to show the position of the crown during winding or setting. A coaxial button in the crown controls the start/stop and return to zero functions of the double retrograde chronograph and the push button in the case band at 11'o clock activates and restarts the rattrapante chronograph function. You can also notice a totally un -obstructive and new design of the concealed flush fit alarm winding crown located in the case band at the 4'o clock position.
Both dials are made of soiled silver, while the rotating discs for the displays are made of aluminium which is light weight. The meantime dial is of regulator style, displaying the hours, minutes, and seconds on separate chapter rings. The first displays some world premier horological functions developed by the Vacheron Constantin watchmakers and seen for the first time ever in this watch.

First dial: 
The Hebraic perpetual calendar
Of the utmost technical and mathematical complexity, the Hebraic perpetual calendar truly is considered to be one of the greatest contributions to traditional watchmaking of recent times. Due to the long term changing cycles of the Hebraic calendar and its difference to the Gregorian calendar, the making of a complete functioning mechanical Hebraic perpetual calendar in a watch has been impossible until now. Highly complicated mathematical calculations combining both the lunar months and solar year were transcribed into not only an operational mechanism but a display that is elegant, logical and easy to read.
The Hebraic perpetual calendar works on the principle of the 19 year Metonic cycle because 19 years it is almost exactly a multiple of the solar year and lunar month over that period. On this watch the Metonic cycle is displayed as a sector a 3'o clock concentric with the chronograph hour register. The sacred date of Yom Kippur indicated in the Gregorian calendar each year, is represented by the corresponding retrograde hand at 6'o clock, which returns to its starting point every 19 years, at which time the sector is replaced for another for each of the 19 year cycles.

To keep the 12 month lunar year in pace with the solar year, a 13th leap month called an intercalary month has to be added seven times during the 19 year cycle. Ingeniously the watch not only allows for this addition but also show the user whether the current year is a 12 or 13-month year via an indicator hand and 12/13 display situated concentric with the chronograph minute register and counter hand in the 9'o clock position.
In the Hebrew calendar, there are fixed lunar months of 29 or 30 days alternately. Those of Cheshvan and Kislev can have 29 or 30 days, depending on the year, here, the self correcting date hand is concentric to the Yom Kippur sector and constant seconds. On either side of the date, two windows indicate the number of days and months in Hebrew.
The secular Hebrew calendar, which is displayed in a four digit window below the Yom Kippur sector, is calculated from the supposed date to the creation of the world in 3760 BC. To calculate the present year in the Hebrew calendar 2015 is added to 3760 giving the year 5775. The Jewish New Year begins again in September 2015 with therefore the Hebrew year 5776. Tishrei is the first month of the Hebrew calendar.
Within the centre of the hour chapter ring are four representations of the moon phases and also a hand indicating the age of the moon within its 29. 5305882 day cycle. The Vacheron Constantin moon phase system requires correction only once every 1027 years.

Double Retrograde Rattrapante Chronograph
Featuring a totally innovative design and construction, the Vacheron Constantin retrograde rattrapante chronograph is completely new to the world of watch making. This is the first watch ever to be made with a rattrapante chronograph with double retrograde function. This ingenious chronograph is read by the user exactly in the manner of a classic split seconds chronograph; uniquely however, whilst both hands still work in unison and from the same axis, unlike all other split seconds chronographs, the two hands never actually meet but operate on two separate scales on opposing sides of the dial. In this respect, the new chronograph can perhaps be the best described as a detached split seconds chronograph. To create this function, a new chronograph mechanism has been invented and made entirely in house at Vacheron Constantin especially for this timepiece.
Further, it has been necessary to specially design and make the two long and very fine chronograph hands so that chronograph has perfect stability and extreme accuracy during operation. There are two register dials for the chronograph counting each elapsed minute up to 60 minutes and each elapsed hour up to 12 hours so that events up to 12 hours in duration can be accurately recorded.

The Westminster Chiming, Alarm and Night Silence Feature
Sectors can be seen on the dial to either side of the hour chapter ring, just above the chronograph registers. These sectors with their corresponding hands are indicators for the selection of the mode of chiming, mode of alarm striking and the alarm power reserve indicator.
This watch offers 3 possible striking modes:
  • Striking: The watch chimes automatically at each passing quarter hour, in the same way as a clock. With five hammers striking five finely tuned steel gongs, the chiming sequence is that of Big Ben, the clock of the Palace of Westminster in London.
  • Night silence: Chiming automatically disables from 22h to 8h
  • Silence: Chiming switched off when it is not desired.
There are two additional options to choose from; Grand sonnerie(striking the hours and the quarters at ever passing quarter) and alternatively petite sonnerie(striking the full hours at the hour but only a quarter strike without hours on the quarters). To repeat the chiming at any time, the slide on the band of the case can be activated whenever it is desired by the user.

Night time silence : A unique and very user friendly new feature has been developed especially for the chiming system of this watch, that of the automatically activated Night Time Silence Mode. A special mechanism has been developed by Vacheron Constantin enables the watch for not chiming between the hours 22h-08h in order not to disturb its owner. This system is unique in being the first to be automatically activated without the need to manually set the chime or silence option.

Alarm: In addition to the chiming mechanism, this model houses an integrally connected alarm system with separate power reserve indication. This mechanism allows a choice between either a traditional alarm on an additional differently tuned single gong with single hammer or Westminster Carillion full chiming alarm in either Grande or Petite Sonnerie mode. The alarm is set via the winding crown which moves an additional alarm hand co-axial with the hour and moon's age hand. The flush fit winding button is situated in the band of the case.

The Second Dial
As well as the astronomical indications, several unique and major systems developed especially for this watch are presented here including a 12 hour second time zone governed by a digital world time display, a double perpetual calendar and a remarkable fully visible armillary sphere tourbillon.
The blue star chart in the upper half of the dial represents the night sky and the star constellations visible from user's home city, with the months appearing around the edge. Concentric around the outer border is the scale for the retrograde date of the perpetual calendar, the hand flying back to its start point at the end of each month. Subsidiary dials for the days of the week and the months flank the star dial and the aperture above the month dial shows the number of the year between 1 and 4 in the leap year cycle. Around the edge of the dial are three astronomic scales which are read using the central gold hand identified by its sun counterpoise. The outermost scale for the year divided into zodiac sign periods additionally indicates the dates of Vernal and Autumnal Equinoxes and the summer and winter solstices. The interrelated four seasons are displayed on a further inner concentric ring.
The sector above the tourbillon aperture indicates equation of time showing the discrepancy between true solar time and standard meantime which fluctuates during the year but can be ahead by as much as 16 minutes (around November 3rd) and behind by 14 minutes (around February 12th). Solar and meantime are equal on just for occasions each year. Flanking the tourbillon aperture are two dual sectors for the time of sunrise and day length and time of sunset and night length in the user's home city. These indications are calculated from the hours of light and darkness and not strictly set times.

Another world premier feature is the 12 hour second time zone dial with separates day and night indicator window located in the 10th clock position; the second time zone is used in conjunction with the digitally displayed world time function which gives a choice of 24 cities and countries and their respective time deviations from Greenwich Meantime. This thoroughly new and discreet 12 hour system of world time mechanism and display is the first new system to be developed since Louis Cottier's well known world time system with 24 hour indication invented about 1935 and is therefore of major significance.

The Dual Function Perpetual Calendar
The perpetual calendar systems invented and built by the watch makers of Vacheron Constantin are amongst the greatest achievements made during the construction of this watch. They represent Vacheron Constantin’s supreme mastery of both highly complex mathematical calculations and the ability of their watch making team to translate the calculations into mechanisms functioning in complete harmony in relation to the myriad other functions. Including the Hebraic perpetual calendar seen on the other dial, this watch has the ability to provide three entirely different perpetual calendar readings. The fundamental new departure is that two possible options are available for the reading of the Gregorian perpetual calendar displayed on this dial: either the traditional Gregorian calendar or the business calendar system known as ISO 8601, a numerical system which utilises 52 weeks and 7 days.
The Gregorian perpetual calendar which automatically corrects itself for the appropriate number of days in the month and the leap years can be read on the dial using the retrograde date, the days of the week and months dials, with the leap year window displaying a number between 1 and 4 located to the right side of the retrograde date sector.
The ISO 8601 business calendar is a specific system founded by the International Organisation for Standardization and used mainly in international financial sector. The purpose of this standard is to provide an unambiguous method of representing dates and times, so as to avoid misinterpretation of numeric representations of dates and times, particularly when data are transferred between countries with different conventions for writing numeric dates and times. When times are also required under the ISO system, they are given using the 24 hour system and with time zone information where necessary. Both these functions are also present on this dial.

When the ISO 8601 mode is employed, the number of the week within the year and the number of the day within the week takes precedence over the traditional calendar month and traditional date, the number of the week is read from the dial concentric to the month indication and the number of the day within the week is indicated by a number between 1 (for Monday) and 7 (for Sunday) in a window directly above the week dial.
The ISO system has a full cycle of 400 years and employs a seven day cycle with weeks starting on a Monday. However, an ISO year can have either 52 or in some cases 53 full weeks when New Year's Day falls on a Thursday (Wednesday or Thursday in leap years): this occurs every 5 or 6 years. In the ISO system, week 1 is the one which contains the first Thursday of the year and always contains the January 4th. The last week of the year in the ISO calendar is the one that contains the last Thursday and always includes December 28th. This system requires the user to adopt a different way of interpretation, for example: if the calendar is displaying Thursday, September 17th, the ISO calendar will read as day 4 in the day aperture and W 38 on the week dial.

Another option in the mechanism of this ingenious system is that it can be switched from ISO mode to traditional calendar year model. A calendar year is the period beginning January 1 and ending on December 31. Its programming mode will therefore also on 1 January of the year put the number of days of the week in synchronization with the first day of the calendar year. If the annual calendar displays the first day of the year on Thursday, January 1, the calendar will display w1 on the week dial and 1 in the day window.

The Armillary Sphere Tourbillon
The mesmerising armillary tourbillon cage containing the watch's escapement is visible through the aperture beneath the sky chart. This supremely elegant mechanism displays a three dimensional constantly rotating sphere moving with the utmost delicacy simultaneously in three directions. Appropriately, the watch maker has also chosen to use a spherical balance spring which not only adds to the elegance of the mechanism, its special properties contribute to the accuracy of the watch.
This tourbillon was named armillary because visually it is reminiscent of the circles and rings of the scientific instrument known as the armillary sphere. It was placed in the second dial side complementing the astronomical functions to suggest the apparent movement of the stars, the sun and the ecliptic around the earth. The frame of the cage itself, made of ultra light aluminium and carrying the escapement and balance, is ingeniously constructed to incorporate the Vacheron Constant company symbol of Maltese Cross, once every 15 seconds during the tourbillon’s   rotation, the Maltese Cross becomes fully visible to the viewer.
The armillary sphere tourbillon is a feat of high precision watch making. Made of the lightest of material, its purpose is to minimize the effects of gravity on the balance wheel, hair spring and pallet fork of the escapement. The tourbillon is essentially a revolving platform and cage upon which the whole escapement is mounted that makes one full rotation in one minute. In this tourbillon, the escapement is rotated in three planes at once. the escapement has two further exceptional features: a spherical balance spring and diamond anchor plates.
Technical details
Reference: 57260/000G -B046
Hallmark of Geneva Certified timepiece

Movement
Calibre 3750
Developed and manufactured by Vacheron Constantin
Mechanical manual winding
72 mm (31''1/2) diameter, 36 mm thick
Approximately 60 hours of power reserve
Frequency: 2.5 Hz(18,000 vph)
More than 2800 components
242 jewels

Calibre plate
Plate 150: chronograph
Plate 250: Gregorian perpetual calendar
Plate 350: chronograph and Hebraic perpetual calendar
Plate 550: astronomic calendar

Indications
Time functions (6)
Perpetual calendar functions: Gregorian and Hebraic (15)
Astronomic calendar functions (9)
Lunar calendar functions (1)
Religious calendar functions (1)
Chronograph (3 column wheels) functions (4)
Alarm functions (6)
Westminster Carillion striking functions (8)
Further functions (7)

Case
18k white gold
98 mm diameter, 50.55 mm thick
Not water resistant

Dials
Metal
Silvered opaline
Number of hands: front 19/back : 12

Accessories
Delivered with a corrector pen and magnifying glass

Rarity
Unique piece crafted on demand
Total weight: 960 gm

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