This is an Omega Chronostop reference 146.009 which dates to 1969. 
This model is very interesting with its single chronograph recorder which times for 60 seconds. This function is working correctly and resets when releasing the chronograph button. The mechanical hand wound movement is also keeping good time for a vintage watch.
The light grey 'dished' shaped dial is very striking with its orange Omega logo and chrono hand. The dial is in good condition for its age with signs of wear/marks. The watch has the original signed Omega crystal.
The stainless steel case measures 34.65mm in diameter excluding the signed Omega crown. For its age, the case is still very attractive on the wrist. It does show marks in line with its age.
The watch has been fitted with a brand new high quality leather strap with Omega buckle fitted. It also comes in a very good condition vintage Omega box.