Chronoswiss Perpetual Calendar

Introduced in 2006, the perpetual calendar watch by Chronoswiss belongs to the brand’s exclusive family of complication timepieces like Quarter Repeaters and Flying Tourbillon.

The first Chronoswiss-models with eternal calendar already had automatic movements. They were then manufactured by ETA. But this model contains the exclusive Chronoswiss manufacture-Caliber C. 127, which most reliably and precisely drives the complicated app. 50-part calendar-module.

Chronoswiss Perpetual Calendar

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, 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. This 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 Chronoswiss “Perpetual Calendar” watch 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.

Technical details

Model: Chronoswiss Perpetual Calendar

References
CH 1720 Platinum 950, limited to 99 pieces
CH 1721 18 Ct. Gold 2N
CH 1721 R 18Ct. Rose gold 5N
CH 1721 W 18Ct. White gold
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

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