Introduction to the various calibers used for the Omega Seamaster 600 model.
- Omega caliber 601, in production 1962-1970, movement serial between 190xxxxx-320xxxxx. Caliber 601 was fitted in the case references 135.011 and 135.012.
- Omega caliber 611, date, in production 1962-1967, movement serial between 190xxxxx-250xxxxx. Caliber 611 was fitted in the case references 136.011 and 136.012.
- Omega caliber 613, quickset date, in production 1967-1973, movement serial between 250xxxxx-360xxxxx. Caliber 613 was fitted in the case references 136.011 and 136.012.
