Without seeing the movement, it's impossible to say anything for sure. However, this looks like a US market Omega bumper movement (cal. 351 or 354) watch. What's a bit odd is that it looks about 20 years older than the 1971 date on the back.
The dial was probably refinished, maybe when the presentation was done. Hands look correct.
Please post some pictures when the watchmaker opens up the watch for you.
gatorcpa
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