Omega Speedmaster '57 Omega Co-Axial Chronograph Watch - 41.5 mm Yellow Gold Case - Brushed Bezel - Silver Dial - 331.50.42.51.02.001

41.5 mm 18K yellow gold case, transparent back, brushed bezel with with tachymeter scale, scratch-resistant sapphire crystal with anti-reflective treatment on both sides, silver dial, self-winding chronometer Omega 9301 movement with Co-Axial Escapement, chronograph, date, and small seconds, approximately 60 hours of power reserve, 18K yellow gold bracelet. Water resistant to 100 m.