IWC Case Polished stainless steel diver case, solid stainless steel caseback with engraved submarine, winding crown at 4 o'clock, diver bezel crown at 2 o'clock Strap Dark brown calf leather strap Dial Black dial with applied luminous indices, date indication at 3 o'clock, rotating decompression bezel Movement Nickel-plated automatic movement, with Geneva stripes, Breguet hairspring, date function Cal. 8541 Ref. 812 Case No. 18429** D= 37.5 mm Year 1972
