Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Sedna Gold Case - Black Diamond Dial - Black Leather Strap - 304.63.44.52.01.00144. 25 mm 18K Sedna gold case with anti magnetic properties, transparent back, 18K Sedna gold bezel with black ceramic ring and Ceragold tachymeter scale, scratch resistant sapphire crystal with anti reflective treatment on both sides, black sun brushed dial with diamond polished 18K Sedna gold indexes and hands, caliber 9905 self winding Co Axial master chronometer movement with chronograph and moonphase indication, approximately 60 hours of power