Omega Speedmaster Chronoscope Co‑Axial Master Chronometer Chronograph 43 mm 329.30.43.51.02.001. 

Omega 9908 Manual Winding chronograph movement with central chronograph hand. Black 60-minute and 12-hour recorder at 3 o'clock, small seconds counter at 9 o'clock position. Silver dial with Arabic numerals. Blue anodized aluminium bezel stamped with a Tachymeter scale and set on a 43mm stainless steel case. Sapphire crystal on top and sapphire display caseback. Water resistant to 50M. Stainless steel with steel folding clasp.