The U-Boat dive watch Sommerso 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 to 300 meters. Movement:swiss automatic mechanical, personalized to U-BOAT specifications.Frequency:28,800 vibrations per hour.Power reserve:38 hours. 25 jewels. Skeleton balance wheel.Functions:date, hours, minutes, seconds, 24h indicator, graduated uni directional 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.Crystal:sapphire crystal with anti-reflective coating, lent on the date window. Water Resistance:300 mt, 30 ATM