Help trying to identify an old Omega Gold Watch

Full disclosure I do not own this watch, my neighbor (who owns it) showed it to me and was on his way to take it to the local jewelry story. I asked him to let me do a little research on first and recommended that he should take it to a watch specialty shop (not a jewelry store). Based on what he told me, he has had the watch for 30+ years, and has never worn it, it appears to be gold and has "diamonds" (4) at the 3/6/9/12 hour marks....It's still in the box and has the original price tags on it ($3200). I do not know if it is running, but would assume it needs a good once over and a cleaning....it looked flawless.

I looked around online and could not find any just like it, I even tried the Omega Vintage watch site.....

I'm trying to help him figure out exactly what he has and determine the value.

Thanks for any help/advice!!

I have on the way (from Japan!) an Omega-branded bracelet that I am fairly confident is real and has the same style of clasp. I know that's proof of nothing, but makes the clasp perhaps slightly more plausible.