U-Boat watch. Darkmoon Black Painted Metal dial with Red Index & Arabic numerals. IPB 316L stainless steel case. Filled with special oil that emphasizes the dial. Innovative locking system (Locking Ring System) with quick battery replacement. Quartz movement. Hours, minutes, screw-down crown. Domed sapphire crystal. 50 meter water resistance. Black Ultra-resistant vulcanised rubber. IBP steel tongue buckle. 44mm case diameter.