转载自timezone
The complicated side of Chronoswiss: The Perpetual Calendar
It can't be said differently: Chronoswiss is getting complicated. Pretty complicated in fact.
After the exclusive wristwatches with quarter repeaters and flying Tourbillon, the Munich-based watch manufacturer now comes up with a perpetual calendar watch. Already in 1985, when Gerd-Rüdiger Lang was significantly involved in the renaissance of mechanical timekeeping, he also offered wrist-watches whose calendar-based accuracy would last until February 28, 2100. Therefore, they sufficed according to what Gajus Julius Caesar's created in 45 B.C. in collaboration with the astronomer Sosigenes, which most likely was his politically most significant accomplishment in history: the so-called Julian Calendar. Basically, the same calendar with its progression of three normal years of each 365 days and a leap-year with 366 days has lasted until the present. Only a small blemish caused Pope Gregory the XIIIth to act. Not a big deal but still. The Julian year was all of eleven minutes and 14 seconds or 0.0078 days too long. They mixed up the Christian course of the year and urgently had to be eliminated. How? Simple! In the future, the 29th of February had to be skipped in all secular years that couldn't be divided by 400. In other words: in 1700, 1800 and 1900, that day did not exist. In 2100, 2200 etc. it will be eliminated as well.
Quem juckat? Latin students would say. So, who cares?
That's what Gerd-Rüdiger Lang thought about with his current "complication". It is linked to the inheritance of great master watchmakers such as Thomas Mudge, who most likely presented the first pocket-watch in 1764, which was able to correctly handle different lengths of months in normal- as well as leap-years. It therefore possessed what is now commonly called the eternal calendar. The first wrist-watch of this complex genre followed exactly 163 later, supplied with a hand-wound movement. The first Chronoswiss-models with eternal calendar already had automatic movements. They were then manufactured by ETA. But the brand-new model contains the exclusive Chronoswiss manufacture-Caliber C. 127, which most reliably and precisely drives the complicated app. 50-part calendar-module.
Lang's philosophy is based on the systematic examination of the horological tradition. Part of this examination is the subtle knowledge pertaining to the lengths and the proportions of the hands, the design of the dial and the execution of the case. When it comes to the horological application, functionality, dependability, precision and craftsmanship detail are the top priorities.
This statement can be confirmed in no time at all with one glance through the sapphire-crystal base at the automatic Chronoswiss caliber C.127. The balance-wheel makes 21,600 vibrations per hour. The ball bearing rotor passes its stored energy very efficiently to the tension spring. Entirely wound-up, its power-reserve lasts for about forty hours. Things are different when it comes to the intricate calendar-gears. It accomplishes its calendar-tasks beneath the dial and is hidden from curious looks. But not because it has something to hide, but only because of technical reasons. After all, three staffs which indicate the day of the week, the date and the month as well as a lunar disk protrude outward.
The specialty of the calendar-module 5800 C consists of a level-disk (see attachment with technical drawing of the module), which turns around its own axis once every four years. Grooves in the circumference indicate the lengths of the different months to the mechanism. Contrary to the ordinary, the lunar disk also turns to the left since Gerd-Rüdiger Lang desired a toppled indication of the livid moon for aesthetic reasons.
Since Chronoswiss has always given credit where credit is due, it should not be concealed here that the complicated, exclusive Chronoswiss calendar-module originates from the mechanic specialist Dubois Dépraz from the Vallée de Joux in Switzerland. The gears have a diameter of 26.2 mm and a height of 5.2 mm and 30 jewels. The massive crown and adjustment pushers do not have to be exchanged during water-resistance tests since the crown's gaskets are directly attached to the tube. This service-friendly system only requires the replacement of the gaskets themselves and it is essential cheaper.
The new "Perpetual Calendar" is visually stunning because of its harmonic ensemble of massive silver dial with varnished top and blue steel hands in the "Poire Stuart" style. It is in perfect harmony with the massive, 36-part case. Characteristic of the complication is the elimination of the knurled bezel, which stylistically unifies the "Perpetual Calendar" with the repeater wristwatch. Now, it's time to strap this eye-catcher to the wrist and to be magnetized by the dial. It's especially exciting at the end of the month when the hands magically jump to the first, no matter if it was the 28th, 29th, 30th or 31st. Otherwise Chronoswiss could have saved itself all the hassle.
Model: Wristwatch (automatic) with perpetual calendar and lunar indication
Reference: CH 1720 Platinum 950, limited to 99 pieces
CH 1721 18 Ct. Gold 2N
CH 1721 R 18Ct. Rosegold 5N
CH 1721 W 18Ct. Whitegold
CH 1723 Steel
Display: Hour and minute, great second, date-indication, day of the week-display, 48- months- indication, indication of the leap-year, lunar indication, and lunar age
Case: massive 36-part case, Ø 40 mm, height 12.9 mm, pusher and turnip-crown and adjustment pusher as part of the case, adjustment pusher screwed, screwed and polished bezel with one-sided non-reflective sapphire crystal, screw-on case back with full-thread and one-sided non-reflective sapphire crystal, screw-on lugs with patented system Autobloc, water-resistant up to 3 atm (30m)
Movement: Chronoswiss Manufacture Caliber C.127,
Ø 26.80 mm (11 3/4´´´), 30 jewels (incl. module), Incabloc shock absorber,
40 hours power reserve, 3 Hz., 21,600 A/h (vibrations), fine adjustment pusher by eccentric, individually numbered
Module: Calendar-Module 5800 C (Dubois-Dépraz), 48-level indication, module
Ø 26.20 mm, left-running lunar phase, reserved for Chronoswiss
Dial: massive 925 Sterling-Silver dial, colour: off-white (Coquille d'oeuf)
blue-varnished Steel hands, shape: Poire Stuart