Omega Style No: 310.60.42.50.01.001 Omega Speedmaster Moonwatch Professional Co-Axial Master Chronometer Chronograph - 42 mm Sedna Gold Case - Black Step Dial

42 mm sedna gold case, transparent back, anodised aluminium bezel ring, domed scratch-resistant sapphire crystal with anti-reflective treatment inside, black step dial, Calibre 3861 manual-winding chronometer movement with chronograph and small seconds. Water resistant to 50 metres (167 feet).