Equipped with the in house developed UN-153 calibre featuring the silicium balance-spring, the Marine Chronograph Annual Calendar is an innovative, simple to use, complication timepiece incorporating stop watch and calendar functions.
The Marine Chronograph Annual Calendar mechanism contains only a dozen elements. In a development of the simple calendar developed for the UN-118 caliber, the annual calendar needed only three additional wheels—a challenge that personifies the spirit of Ludwig Oechslin. The new UN-153 caliber is manufactured entirely in-house and beats at 28,800 vibrations per hour, proof of its extreme precision. As for the silicon balance-spring and escapement, they are provided by the company Sigatec, which is co-owned by Ulysse Nardin.
This particularly well designed movement allows the time and calendar pointers to be moved in either direction. The model also includes a chronograph feature. Apart from the central hands indicating the hours, minutes, and seconds, the 30-minute counter is displayed at 3 o’clock, the hour counter at 6 o’clock and the small second counter at 9 o’clock. The latter also features a month display, which includes sub-dials offering useful guide-marks when setting. Finally, the date is displayed in a window at 6 o’clock.
Following the footsteps of the Marine Chronometer Manufacture (2012) and the Marine Chronograph Manufacture (2013) models, the Marine Chronograph Annual Calendar bears the same outstanding classic forms as sailing instruments, including a ribbed bezel, a screw-crown guaranteeing perfect water resistance, a full lug width ensuring admirable stability on the wrist and a generous 43 mm diameter case for excellent readability.
Model: Marine Chronograph Annual Calendar
In-house designed movement
Silicium escapement and spring, 28’800 v/h
Power-Reserve: approximately 52 h
Chronograph with seconds hand in the centre
30 minutes counter at 3 o’clock
12 hours counter at 6 o’clock
Small seconds counter at 9 o’clock
Annual calendar, backward/forward setting, with months counter at 9 o’clock
Date at 6’clock
Bezel: fluted, stainless steel
Crown: screw down security crown, covered with rubber
Diameter: 43 mm
Water-resistance: 100 m
Crystal: anti-reflective sapphire crystal
Case-back: open case back with sapphire crystal
Egg shell or blue with roman numerals
Leather strap with folding buckle