Jaeger-LeCoultre will service these, but as you might guess, it’s incredibly expensive. The cases were plated in 24K gold, also very expensive. You are looking at several times the value to get it running again.
The original Atmos clocks of the 1920’s were powered by mercury and barometric pressure. Once the dangers of mercury were better understood, they switched to a temperature driven system powered by ethyl chloride, which boils at room temperature.
There is a simple formula for dating Atmos clocks made in 1954 or later. Take the serial number and divide it by 20,000. Add that to 1954, and you should be within a year or two. Your clock is right around 1954, maybe 1955.
Here is the go to person for Atmos in the USA.
http://www.atmosman.com/atmos.html
There is just a wealth of information on his site.
Good luck with the project.
gatorcpa
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