Omega Style No: 332.10.41.51.10.001 Omega Speedmaster '57 Co-Axial Master Chronometer Chronograph - 40.5 mm Steel Case - Green Dial

40.5 mm steel case, transparent back, brushed bezel with blackened tachymeter scale, scratch-resistant sapphire crystal with anti-reflective treatment on both sides, green dial with rhodium-plated hour markers and Broad Arrow hands - all featuring white Super-LumiNova, Calibre 9906 manual-winding chronometer movement with chronograph, small seconds, and date. Water resistant to 50 metres (167 feet).