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Amazing thank you very much for the insight. Now does that mean that every piece with the “5” key was produced by Georges Croisier? For example, I see that some famous Patek Philippe cases retain the same mark; does that mean our Cartier case was produced by the same gentleman or group of case ...

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https://i.postimg.cc/Cx4Hgx6N/IMG-5979.jpg
Hi Phil,

Thank you very much how interesting! I appreciate your help as I would not have been able to discover this myself.

I was also wondering do you happen to know what this “key” shape with a 5 is on the ...

https://i.postimg.cc/RNjqg3cx/IMG-5979.png
https://i.postimg.cc/VdSd990F/Screenshot-2024-05-11-at-6-54-35-PM.jpg

Hi, I have some questions about the hallmarks on my cartier watch. The movement is a Cartier stamped Felsa 22, which dates to the 1960s. The hallmarks appear to be london, I see the ...