This is a nice condition Omega Cosmic Seamaster Reference 165.026 from 1966. This watch has a rare grey two tone dial. It is powered by an automatic caliber 552 movement. 

The steel case of this watch measures 35mm and is unpolished. The Cosmic line of watches has a unique one piece case. The movement is removed through the crystal. 

The watch is mounted on a grey calfskin strap that matches the dial well. 

This watch has been serviced and is running well. It will come with a one year warranty.