Omega Seamaster Planet Ocean 600M Co-Axial Master Chronometer Limited Edition of 88 Watch - 43.5 mm White Gold Case - Unidirectional Bezel - Blued Mother-Of-Pearl Dial - Blue Leather Strap - 215.58.44.21.07.00143. 5 mm 18K white gold case with helium escape valve, transparent back, unidirectional rotating bezel along with gradient blue sapphires over the first 15 minutes and an orange sapphire set at 12 o'clock, domed scratch resistant sapphire crystal anti reflective treatment on both sides, blued mother of pearl dial features 18K white gold indexes filled with Super LumiNova, Caliber Omega 8901 self winding movement with co axial escapement, chronometer,