Good place to purchase vintage 321 movement?

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Been searching around now for a while for a 321 movement for a project and am not having much luck. Anyone know of some good places to look into as I have discovered a number of vintage part sellers are smaller thus hard to find?

Thanks for any help!
 
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I saw a couple of cal 321 chronographs for sale for ca 2,5k few weeks ago. Not sure if it was on ebay... But, that Ricardo price is great if it's really NOS.
 
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That looks like it’s been put together from 2 or more movements. I don’t think that color difference is just the lighting.
 
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That looks like it’s been put together from 2 or more movements. I don’t think that color difference is just the lighting.
Yes, I’m no expert but it has a later asymmetric clutch bridge but and early regulator?