Omega Seamaster Diver 300M Omega Co-Axial Master Chronometer Chronograph - 44 mm Steel Case - Blue Dial - 210.30.44.51.03.00144 mm steel case with anti magnetic protection and helium escape valve, transparent back, polished blue ceramic bezel, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, blue 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, steel bracelet. Water