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I would say crystal is the same.
A Rolexforums member just purchased the sapphire Speedy from Omega yesterday, and the bracelet is now equipped with the on the fly micro adjustable clasp. The halo ring seems to have disappeared as well according to him and the photos
My understanding is the new 321 version got a newer sapphire crystal that had less milk ring effect. Maybe the 3861 is getting that newer crystal now? Don’t think it was the case before. Please correct me if I’m wrong about the 321.