Looks nice, congrats! I would not try to pre solve this, send to your watchmaker and deal with it once you have more info from them about exactly what is going on. In my experience, it's the other way around, people are generally putting newer rotors into older mvmts, because there was a design upgrade and they are interchangeable. I guess it would probably work the other way around, and the only point would be maybe to save money, but I wouldn't do that. Good luck with the repairs, hopefully it's not too expensive.
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