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Jaeger-LeCoultre

Development indicator device for the mainspring winding watch...

 

Nilo,

Indeed, JLC have many "first" - but this time I suspect that it was a joint venture together with Zodiac.

Patent - filed 1948, granted 1952:







 

Here is an article about the Power reserve indicator function from 1949:





















 

Best, my friend

Blomman

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