It's mid 60ies, manual wound and not automatic. What you mean is probably mechanical. Calibre 610. The reference I don't know by heart It's a front loader, so don't try to take off the back. Others have tried this with unfortunate damages as a result
If it were an automatic, it would say AUTOMATIC under OMEGA on the dial. It's either a franken or a redial made from parts from the early to mid 60's.