Omega Style No: 522.50.45.52.03.001 Omega Speedmaster Chrono Chime Co-Axial Master Chronometer Chronograph - 45 mm Sedna Gold Case - Blue Dial

45 mm sedna gold case, transparent back, features an inner bezel and subdials in 18K Sedna Gold “exclusive acoustic waves”, scratch-resistant sapphire crystal with anti-reflective treatment on both sides, blue dial, Omega 1932 chronometer movement with chronograph and small seconds. Water resistant to 30 metres (100 feet).