What is this?

[Oras]

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  

 

[Marc]

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.

[oldhippy]

I would say the same as Marc. They look to be in very good condition. From what I can see of the cards there is no yellowing.

[JohnR725]

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.

[jdm]

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!

[Oras]

Thank you gentlemen. I’ll hang on to them. Perhaps one day someone will be able to enlighten us.