The calendar indications of the Jean Dunand Shabaka watch are presented with help of four cylinders. The cylinders are rotated by four different 90-degree transmission systems, each provided with a security device for precise calendar changes.
As for the dates, they are featured via two digits on separate cylinders. The days and months perform an instantaneous jump at midnight, when a sprung mechanism is released. With help of the brand’s proprietary flywheel mechanism regulated by a train, any shock from jumping is minimized, thus keeping the mechanism away from premature wear and tear.
Leap-year cycles are also featured in a completely novel way – there is a white plate beneath the dial, in a special cut-out on between 7 and 8 o’clock, illuminating the letter B (implying “bissextile”) and the three ordinary years.
The phases of the moon mirror the leap-year. The black discs skim over the surface of the moon as the shadow of the earth - it is eclipsed to the left as it wanes, and it is revealed from the right as it waxes. The Shabaka moon deviates from the real moon by just one day in the period of 120 years.
The case back of the Jean Dunand Shabaka watch holds one more surprise - the state-of-wind indicator, both simple and original. It is represented by a single moving part, the mainspring itself in an open barrel, indicating the state of a 45-hour power reserve of the watch against a scale.
Just two chronograph-like pushers are used for setting all the calendar functions. The 4 o’clock pusher advances the date a day at a time, while the 2 o’clock pusher advances days only. A push-piece that is set coaxially in the crown is necessary for advancing the months and years, while the moon is set by a push-piece found in the case-band at 5 o’clock.
A sophisticated group of levers and rolls make their way around the movement from the pushers, activating the respective calendar indications.
The caliber boasts a highly original construction built from 721 parts. The perpetual calendar mechanism is integrated into the 13-ligne repeating movement. The cylinders, 7mm in diameter, are inserted 2.5 mm into the level of the minute-repeater, thus diminishing the movement thickness.
The circular-grained baseplate and the bridges demonstrate an anthracite-black finish creating a fine contrast with burnished steel, ruby and gold. The dazzling movement beauty is revealed via the transparent case-back.
The Jean Dunand Shabaka watch demonstrates an 18k white or red gold case and a high-tech multilevel dial. The case is 30-meter water-resistant.