Omega Seamaster Planet Ocean 600M Co-Axial Master Chronometer Chronograph Deep Black Watch - 45.5 mm Black Ceramic Case - Unidirectional Bezel - Black Ceramic Dial - Black Rubber Strap - 215.92.46.51.01.00145. 5 mm black ceramic case with helium escape valve, transparent back, screw in crown, unidirectional rotating bezel with orange rubber and Liquidmetal diving scale, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, black ceramic dial with 18K white gold hands and indexes, caliber 9900 self winding Co Axial master chronometer movement with chronograph and date functions, approximately 60 hours of power reserve,