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Jaeger-LeCoultre

A question: The caseback

 

The caseback on the vintage:

Were the cases for these made by EPSA or under licence by JLC? The reason I ask is that the case-inner is marked with JLC and the diving helmet and Brevet # of the compressor cases.

I am also rather surprised at the rough chamfering of the hole in the caseback for the alarm pin.

Also, the alarm hammer. Where is it located on the movement?

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