Omega Speedmaster Chronoscope Co‑Axial Master Chronometer Chronograph 43 mm 329.92.43.51.10.001. 

Omega 9908 Manual Winding chronograph movement with central chronograph hand. Silvery 60-minute and 12-hour recorder at 3 o'clock, small seconds counter at 9 o'clock position. Oxidised bronze dial featuring a special patina and opaline finish with Arabic numerals. Polished brown ceramic bezel ring with its tachymeter scale in "vintage" enamel and set on a 43mm Bronze Gold case. Sapphire crystal on top and sapphire display caseback. Water resistant to 50M. Brown leather strap with tang buckle.