1970s Gold Omega Automatic help

I posted this on watchseek but only received a guess on the caliber. My dad gave me this watch, he said he purchased it in the 1970s after graduating from law school (so probably mid to late 70s). He recently had it serviced by omega, but he doesn't know the exact model.

I need another link for the bracelet as it is one link too small for me. It has a hesalite crystal. A watchseek member guessed a 1022 caliber. So I put that in the omega vintage watch database and nothing came resembling it. I'm guessing either a sea master or a geneve, it does not have a model name on the dial? The strap says 14k gf.

A lesson on Omega 6 digit model numbers from 1962 into the 80's:

The first digit of that would be a "1" for a man's watch.
The second digit would be a "6" for self winding with center seconds.
The third digit would be a "2" (non-water resistant calendar) or a "6" (water resistant calendar).

That would make the first three 166 or 162. Try both in the vintage database as 162.* and 166.* and see what pops up. That has either a 1020 or a 1022 inside. Your key is the lugs - there's no break between them and the case.

Ok thanks. I'll try that.