Movement Mechanical hand winding, personalized to U-boat specifications for stem to be positioned at 9 o`clock, diameter 36,60 mm. Shock absorber Incabloc, blued screws, visible rubies. 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, 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. For the version with yellow and orange index and hands, available also the shinny case finish. 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 or black glass. Crystal Sapphire, scratchproof, 1,40 mm thick. Strap Black, calf leather, exclusive aero design. Width 26/20 mm. Tongue buckle with U-Boat personalization. Hypoallergenic and colour retain treatment. Water-resistance 100 metres, 10 ATM.