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Can anyone tell me what these cards are?  They are from a watchmakers shop. I bought them just as a record of an era when physical files had to be kept.   Thank you in advance  

 

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My guess is that they are parts interchangeability data for ETA movements, detailing part numbers and all of the different calibres that each part fits.

Potentially still a very useful resource today.

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I am wondering if maybe these were supposed to be in a material house versus watchmaker shop. For those of us that were lucky enough to experience going to a physical material house a lot of their reference material was on cards.

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1 hour ago, JohnR725 said:

I am wondering if maybe these were supposed to be in a material house versus watchmaker shop. For those of us that were lucky enough to experience going to a physical material house a lot of their reference material was on cards.

Agree,  with in/out records to keep track of inventory.. over years or decades!

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