Hate to disagree (respectfully) but if I were a betting man I'd put my money on the OP's watch being an original, un-refinished example. I came upon quite a few examples of this exact variant of 'Seamaster", including this one in the Omega database.
https://www.omegawatches.com/planet-omega/heritage/vintage-details/14716/
The only other alternative I can see is if someone got hold of Omega factory dies, which I suppose is possible. The T Swiss Made T is spot on, too. Perhaps some of the resident experts could chime in.
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