Omega Speedmaster Moonwatch Omega Co-Axial Chronograph Grey Side of the Moon Watch - 42.5 mm Grey Ceramic Case - Platinum Dial - Grey Leather Strap - 311.93.44.51.99.00142. 5 mm grey ceramic case, transparent back, ceramic bezel with tachymeter scale in white Super LumiNova, scratch resistant sapphire crystal with anti reflective treatment on both sides, sand blasted platinum 950 dial, self winding chronometer Omega 9300 movement with Co Axial Escapement, chronograph, date, and small seconds, approximately 60 hours of power reserve, grey leather strap. Water resistant to 50 m.