pocket on the rear of fed zorki etc cases... why ?

we all know those pockets with white cards, or fixed metal plates ... on the back part of fed and zorki cases.
why this ? on very early case, the plate is metal with linen and fixed... on later is a plain white plate made of some kind of plastic...

does anyone know what is the use of this plate ... ?

Stephan

This topic was discussed in the past, you will find the thread with a little search.

Some said it's a protection for the camera-body when pressing the case-buttons, early bodies were not so strong and even on later Zorki-C you can find marks of the case-buttons on the vulcanite or the green and white cover.
Some said it's something to take notes, and often you can find notes on that plastic card.
I think it's a kind of protection.

I thought it was an aid to load film into bottom loader

quote:

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Originally posted by Vlad

I thought it was an aid to load film into bottom loader

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Yes, that is a possibility too and was discussed also.

But Stephan said that first they were made of metal with linen and fixed. I didn't know this, so the original purpose might be protection, then it was changed to a moveable plate to help loading the film and owners also used it to take notes.