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I have recently obtained a set of 3 Dumont brass tweezers  marked 1AM, 2AM, and 3AM plus another marked Rolex Switzerland marked 4BR.

 

The Rolex is a very fine and long pointed which I think is for manipulating hair springs.

 

But I'm unable to see any difference between the 3 Dumonts.

 

Does anyone know the Dumont marking system and am I right about the Rolex one.

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