Movement Mechanical hand winding, personalized to U-boat specifications for stem to be positioned at 9 o'clock, diameter 36,60 mm. Frequency 18.000 vibrations per hour, 2,5 Hz. Power reserve 46 hours. 17 jewels, height 4,5 mm. Functions Hours, minutes, small seconds at 3. Case Steel 316L AISI, satin 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 50 mm. Thickness 15,00 mm. Weight 140 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 coloured pigments added (orange, yellow or white) and the other one cut, treated with composed opaque black pigments. Available also with red glass. Crystal Sapphire, scratchproof, 1,40 mm thick. Strap Black, calf leather, exclusive aero design. Width 26/22 mm. Tongue buckle with U-Boat personalization. Hypoallergenic and colour retain treatment. Hand made and hand finished. Water-resistance 100 metres, 10 ATM.