U-Boat Watch Sommerso DLC 9015. The U-Boat Sommerso dive watch is designed to withstand the rigorous demands of professional diving. The watch features a rotating bezel with calibrated indexes every five minutes and an additional counter for the 24 hours of the day. Sommerso has a water-resistance of 300 meters.
Movement: Swiss automatic mechanical, personalized to U-BOAT specifications. Frequency: 28,800 vibrations per hour, 4 Hz. Power reserve: 38 hours. 26 jewels.
Skeletonized rotor.
Functions: Date, hours, minutes, seconds, 24h indicator, graduated uni directional bezel, screw down crown.
Case: Stainless steel AISI 316L, with subsequent treatment DLC black, distinguishing crown on the left side, with a patented protective device. Serial number plate fixed on the left side of the case. Diameter 46 mm.
Back: Sealed with seven external screws.
Dial: Three superimposed dials, the upper one in black with luminous beige hands, numbers and markers. Blue 24h indicator hand. Steel brushed frame around the numbers.
Crystal: High quality sapphire crystal with anti-reflective treatment, lent on the date window.
Water Resistance: 300 metres, 30 ATM.
Strap: Ultra-resistant vulcanised rubber, in black colour, personalised with the logo of the Maison in relief. Tongue buckle in steel with PVD coating. Width: 22/20 mm.