Ulysse Nardin Diver X Skeleton

Ulysse Nardin's Diver X Skeleton, reference 3723-170-1A/3A, comes in a titanium case measuring 44 mm across. The case is 15.7 mm thick and carries a unidirectional rotating bezel for tracking elapsed dive time. Sapphire crystal covers the grey skeletonised dial, which lays bare the self-winding UN-372 calibre with its silicon escapement and oversized oscillator. Power reserve runs to 72 hours. The openworked construction shows off the movement's architecture rather than hiding it behind a solid dial. A rubber and titanium strap completes the case. Ulysse Nardin rates the piece to 200 metres of water resistance, comfortable for a dive watch of this size.