Omega Speedmaster Moonwatch Omega Co-Axial Chronograph Dark Side of the Moon Watch - 44.25 mm Black Ceramic Case - Diamond Set Ceramic Bezel - Black Ceramic Diamond Dial - Black Leather Strap - 311.98.44.51.51.00144. 25 mm black ceramic case, transparent back, diamond set ceramic bezel, scratch resistant sapphire crystal with anti reflective treatment on both sides, black ceramic dial with diamond set white gold indexes, caliber 9300 self winding movement with chronograph function, approximately 60 hours of power reserve, black leather strap. Water resistant to 50 m (167 ft).