U-Boat Watch Sommerso Bracelet 9007/A/MT. 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. Power reserve: 38 hours. 25 jewels. Skeletonized rotor.
Functions: Date, hours, minutes, seconds, 24h indicator, graduated unidirectional bezel, screw down crown.
Case: Stainless steel AISI 316L, satin hand finish, 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: Sapphire crystal with anti-reflective coating, lent on the date window.
Water Resistance: 300 metres, 30 ATM
Strap: Bracelet in 316L Stainless Steel (Ref.8349). Links with screw-in adjustments instead of pressure pins.