Rate/authencity ref 166.0202 cal 1012

It’s perfectly genuine. The movements Omega fitted in the 1970s look cheap and crappy but actually work well if maintained properly. However, I see some rust on the swan neck regulator spring so this may not necessarily be the case here ie the maintenance may have been lacking. The serial was on a sticker in the round recess by 1012 but has been removed or fallen off. Or may be stuck to the underside of the rotor. You actually have a very nice example of a not particularly desirable model. It looks unworn in fact but probably needs a full service which will add to your outlay. It won’t have too many fans here but I think you could have done a lot worse at the price.