Movement Automatic mechanical chronograph personalized to U-boat specifications for date display and stem to be positioned at 9 o'clock. Frequency 28.800 vibrations per hour, 4 Hz. Power reserve 44 hours. 25 Jewels. Height 7 mm. Functions Hours, minutes, chronograph, counter small seconds at 3, counter 12 at 12, counter 30 minutes at 6. Date window at 9 o`clock. Case Brushed steel 316L AISI or brushed steel 316L AISI with physical vaporization PVD coating treatment. There are 8 steel screws which lock up the back case from the upper side. Serial number engraved on the right hand side of the case and particular horizontal window with movement at sight. Crown at 9. Diameter 50 mm. Thickness 16,60 mm. Weight 167 g approx. Back See-through, with exclusive steel grate. Dial Black with luminous superluminova hands. The dial of this model is made up of two superimposed dials: one white treated with superluminova and white coloured pigments added and the other one cut, treated with composed opaque black pigments. Crystal Sapphire, scratchproof, 1,40mm thick. Strap Rubber (hypoallergenic) with alligator inset, square scales, dark brown. Width 26/20 mm. Tongue buckle with U-Boat personalization. Water-resistance 100 metres, 10 ATM.