U-Boat watch. Darkmoon Black IPB. IPB 316L stainless steel case. Filled with special oil that emphasizes the dial. Black painted metal 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.