Omega Style No: 329.30.43.51.02.002 Omega Speedmaster Chronoscope Co-Axial Master Chronometer Chronograph - 43 mm Steel Case - Silvery Dial

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