BRAND:Omega MODEL:Seamaster Diver 300M Co Axial Master MODEL NUMBER:210.22.42.20.01.004 CALIBRE: Omega 8800 POWER RESERVE: 55 hours CRYSTAL: Domed scratch-resistant sapphire crystal with antireflective treatment on both sides CASE: Steel CASE DIAMETER: 42 m DIAL COLOUR: Black WATER RESISTANCE: 15 bar (150 metres / 500 feet) FEATURES: Anti-magnetic,Chronometer,Date,Master Chronometer Certified,Helium escape valve,Screw-in crown,Transparent case back,Unidirectional rotating bezel