@Pjberr, are you sure that the dial didn't say "DeLuxe" and not "DeVille"?
https://omegaforums.net/threads/fs-omega-seamaster-deluxe-ref-gx6565-circa-1957-1999.79511/
Omega made a Seamaster DeLuxe line in the late 1950's. Some of these were solid gold with gold dials. The automatic versions had caliber 500/501 movements, depending on whether they were designated for sale in the US (17 jewel cal. 500) or elsewhere (20 jewel cal. 501).
The Seamaster DeVille line, to my knowledge, wasn't introduced until the early 1960's. By that time, Omega was using the slimmer series 55X/56X movements. I have never seen a Seamaster DeVille watch with a caliber 500 or 501 movement.
Doesn't mean that they do not exist, just that I haven't seen one.
gatorcpa
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