Hi All,
Bumping this old thread as I have the exact same question and have not been able to come up with a satisfying answer. I understand the origins of the Omega globe symbol but have not been able to confirm if there is any reason a 3539.50 would not have it. This ref came out well after the Costco case and 99% of the pics I've seen have the logo. As OP mentioned, even watches sold in Japan have it so I don't believe it is accurate to say it was only found on US watches.
My assumption is that if a 3539.50 is missing the etching, the only possible explanation is that it was polished off at some point, which in my opinion would reduce the second-hand value. Can anybody confirm whether Omega would have sold any of these without the logo originally?
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