This unworn Ulysse Nardin Diver X Skeleton Azure, reference 3723-170-2B/3A, is a 2025 men’s dive watch with a 44mm black DLC titanium case. The open dial shows the manufacture UN-372 automatic movement through an X-shaped bridge in black and azure. There are no hour numerals on the dial; time is read from the skeleton hands. A unidirectional Carbonium bezel has Arabic markers at 0, 15, 30, and 45.
Water resistance is 200 meters. Sapphire crystal on the front and case back. Power reserve is 72 hours. It comes on an azure rubber strap with a black ceramic Ulysse Nardin plate at 6 o’clock and a folding clasp, plus the original box and papers. The UN-372 is self-winding with a silicon escapement. Functions are hours, minutes, and seconds. Titanium DLC keeps the 44mm diver lighter than steel, and the open case back shows the movement.
