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Patek Philippe

I'm not completely sure, but here's what I found:

 

According to Hodinkee, the "double P" crown was introduced for the caliber 12-600 AT, which, according to Revolution dates back to 1953.


And, according to watch-guy.com, the calatrava was added to the plain crown around 1955.

I hope this is good information: you can check all the links for yourself...

Best, Emmanuel



credit: Hodinkee 

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