Will DON 90 on 3861 fit a pre moon speedy?

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And are they identical? Apologies if the subject has been covered before.
 
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no as the new one uses a gasket
All I can say is LewisWatchCo used to buy these bezels from Omega to fit them on a variety of mods/restorations for clients. That is, until Omega made them exchange only.

Outside of that, I bought a new 1861 directly from Omega last year and it came with the 3861 Don bezel on it. It did not have a gasket. It also fit my ‘84 861 Speedy but I didn’t take a picture of that.