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Didn't Vacheron use LeCoultre movements?

Yes. The V&C cal. 1071 and 1072 are an example of a LeCoultre base that was "reserved" for both V&C and Audemars Piguet (cal. 2071/72).
 
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Yes. The V&C cal. 1071 and 1072 are an example of a LeCoultre base that was reserved for both V&C and Audemars Piguet (cal. 2071/72).
Thank you for the confirmation. Maybe @Rasputin has other information? You raise a good point, that not all LeCoultre-designed Vacheron (or AP) calibers had a LeCoultre version that was also in production. Here is another nice write-up that covers Vacheron's automatic calibers: https://www.watchprosite.com/vacher...tin-sub-second-automatics/14.1170424.9262794/
 
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Thank you for the confirmation. Maybe @Rasputin has other information? You raise a good point, that not all LeCoultre-designed Vacheron (or AP) calibers had a LeCoultre version that was also in production. Here is another nice write-up that covers Vacheron's automatic calibers: https://www.watchprosite.com/vacher...tin-sub-second-automatics/14.1170424.9262794/
The movement is signed Lecoultre with “VXN” on the bridge. However upon further research I determined “VXN” likely signifies an export code rather than Vacheron Constantine as I had originally thought.