Movement Automatic mechanical, 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 40 hours. 25 jewels. Height 4,60 mm. Functions Hours, minutes, seconds, date window at 9 o'clock. Case Steel 316L AISI, PVD coating treatment, sand blast finish. 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. Crown at 9. Diameter 43 mm. Thickness 13,00 mm. Weight 90 g approx. Back See-through, with exclusive movement holder processed with black enamel, with 12 holes to reduce the weight. Dial Black with luminous superluminova hands. The dial of this model is made up of two superimposed dials: one white treated with superluminova and coloured pigments added (yellow or white) and the other one cut, treated with composed opaque black pigments. Available also with red glass. Crystal Sapphire, scratchproof, 1,36 mm thick. Strap Black, calf leather, exclusive aero design. Width 20/20 mm. Tongue buckle with U-Boat personalization. Hypoallergenic and colour retain treatment. Hand made and hand finished. Water-resistance 100 metres, 10 ATM.