Omega Style No: 304.23.44.52.06.001 Omega Speedmaster Moonphase Master Chronometer Chronograph Watch - 44.25 mm Steel Case - Yellow Gold Bezel - Grey Diamond Dial - Grey Leather Strap

44.25 mm stainless steel case with anti-magnetic properties, transparent back, 18K yellow gold crown and push pieces, 18K yellow gold bezel with green ceramic ring and Ceragold tachymeter scale, scratch-resistant sapphire crystal with anti-reflective treatment on both sides, grey sun-brushed dial with diamond polished 18K yellow gold indexes and hands, caliber 9904 self-winding Co-Axial master chronometer movement with chronograph and moonphase indication, approximately 60 hours of power reserve, grey leather strap, polished-brushed foldover buckle. Water resistant to 100 m (330 ft).