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Jaeger-LeCoultre

Here is a....

 

website (and I think it is suitable for a link from here) which has some interesting information about ATMOS clocks including serial number estimation of date of origin. 

http://www.atmosadam.com/

I have no interest in it other than stumbling across it when looking for information on ATMOS clocks.  There is information available on the site which will give you some indication of the origin of your clock according to its serial number as well as photographic examples of these clocks by era.

Of course, contacting JLC directly as suggested will give you the best information but you may find this site of interest.

tempusfugit

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