Omega vintage authentication

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Hi everyone, I'm totally new to the world of Omega (and watches in general) so I could use your help. I'm buying an Omega watch as a remembrance of my grandfather who passed away 2 weeksago. He was a huge Omega fan. I've got my eye on a watch that is likely to have been built around his birthyear 1938. Would you mind checking if this watch is a legit Omega? Thanks!

sorry for posting this twice… smartphone issues...
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