Thanks for that info good sir. I noticed that your watch serial is in a different range all together. 418... vs 903. It makes it even harder to figure out anything production year wise as I saw 12 hour model like yours with 903 serial as well. Heck I saw one that had serial that was only 50 off from mine, and it was a 1873 movement and 12 hour as well. And then I saw 24 hour ones with serial numbers nowhere close to this one. People said Omega was known for mixing and matching parts that they had on hand, Sinn looks to be so much worse haha.
Can you tell me where you contacted Sinn? It wouldnt hurt to send a quick inquiry to see if they can narrow things down for me. And your watch was one of the 1st ones I saw on OF (remember your new watch day thread) that got me hooked on these.
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