Last year, I found a similar American issue SM on Craigslist, and met the owner.
View attachment 485758
This example was passed down from his father, and originally gifted in the '50s on the occasion of a wedding anniversary.
Interesting that the 'A' in 'Omega' on yours is flat-topped, while this one is arched. I've no doubt that both yours and his are contemporary originals, but intrigued by the discrepancy.
Cordially,
Art
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