replacement barrel and crown for vintage constellation

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Hello,

The crown fell off my constellation (see photo attached) and I would like to buy the correct parts so that my local watchmaker can repair.

Can anyone advise what parts I need and where I can source them?

Thanks in advance
 
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Watchmaker can open the case and get the reference number on the inside back

With that and caliber number. Can order the correct crown from any supplier

Also order a new stem just in case
 
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Did your watchmaker ask you to do this? Most watchmakers consider ordering parts to be part of their job.