16+ Omega Seamaster 1968 Gold US. Here i have an excellent example of an ordinary looking but nonetheless beautiful seamaster from 1968. 1968 add to watch list added to your watch list.
The swiss made is in wrong place, too.
That seamaster font was for older versions, the later ones should have this font. I have a little doubt about it though as it's supposed to have some hallmark like in the first picture you posted. Omega seamaster 14k mens vintage watch solid gold, serviced + 12 months warranty. That is if the rest of the case beside the case back is of true 9k gold.