Moonwatch moonphase making strange noise when shaken

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Clearly just normal rotor noise.


No wait....
 
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If you pop out the crown and try to adjust the time, doesn’t it feel like
Something is loose?
No, everything else functions like it should. It is just the sound, which is why I think it is just the dust cover moving around a little.
 
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Depends on the sound. Personally I’d pop the crown out to stop the watch and return it to the watchmaker. I’ve had a movement holder screw come out of an old watch and rattle around inside a long time ago.
 
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This thread reminds me of this guy trying to shake a manual into working.