Omega Style No: 329.30.43.51.03.001 Omega Speedmaster Chronoscope Co-Axial Master Chronometer Chronograph - 43 mm Steel Case - Blue Dial

43 mm steel case, transparent back, blue anodized aluminium bezel ring with tachymeter scale, scratch-resistant sapphire crystal with anti-reflective treatment on both sides, blue dial with silvery subdials, Calibre 9908 manual-winding chronometer movement with chronograph and small seconds. Water resistant to 50 metres (167 feet).