Ulysse Nardin Performance Certificate. Date at 3 o'clock, front and back date corrector. Small seconds counter at 5 o'clock. Automatic screw-on decompression valve system at …
9 o'clock. Silicium spiral and anchor escapement. Caliber UN-320. Rotating, unidirectional, made of titanium, partially covered with rubber bezel. Screw-down security crown. Sapphire crystals.