The Omega 660 watch movement features combined settings for the escape wheel and 3rd wheel through Seiko-Diafix technology. It is equipped with a ball-bearing rotor and a sophisticated excenter self-winding mechanism in just one gear stage. This movement is automatic and does not have a manual wind function. It includes a sweep second hand and a digital display for minutes and hours. The Omega 660 movement was commonly used around the period of 1980.