...but I finally took the time to open it up to see the movement.
Quick back story...my uncle was in the Peace Corp in South America in the late '60s. He traded a Yashica camera for this watch.
Here's what I see as a non-Omega expert:
1) It looks like a real movement. 2) The case appears to be 18kt gold (I had always assumed 14). 3) The movement serial number appears to have been scratched out. As far as I know my uncle never had it serviced...it sat in a drawer until he gifted it to me in 2013 and I had it cleaned and the crystal replaced. This fits with what I assumed to be the sketchy nature of the watch : ) 4) It looks like 'Argentina' and maybe 'Austria' stamped into the inside of the case back.
The 37-38mm size is unusual for the time, as is (I think) the rose gold case and black dial. I had a suspicion that the dial was re-done, but who would redial a watch that was only a few years old at the time? Or is it possibly from the '50s? I wouldn't think so based on the case size.
Could this have been a special edition for a jeweler in South America?
Thoughts? Comments from experts?
Btw, this is the solution to my wedding watch post in Horological Meanderings; it's thin, elegant, classy, and has an interesting history : ) I will be re-gifting it to my son for his wedding and forever...