Omega Seamaster Diver 300M Omega Co-Axial Master Chronometer Chronograph - 44 mm Steel And Sedna Gold Case - Black Dial - Black Rubber Strap - 210.22.44.51.01.00144 mm steel and sedna gold case with anti magnetic protection and helium escape valve, transparent back, polished black ceramic bezel, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, black dial with laser engraved waves and a date window at 6 oclock, Calibre Omega 9900 self winding co axial master chronometer movement with chronograph, small seconds, and date, approximately 60 hours of power reserve, black rubber