but I think those cases are actually old-type slide/transparency storage cases. It was on old reporters/travellers habit of using them to store 35mm film cassettes. It must be 30 years since I last saw that. They are possibly Kodak ones. Hope this helps. Maybe a few other oldtimers will remember them.
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Although I won't regard myself as a 'old timer' I agree with John - they DO look very, very similar to mounted slide return boxes. They certainly seem to be AGFA film boxes because when returned, their slides were in 3 rows of 12 as opposed to the wider Kodak and Fuji boxes with 2 rows of 18. This allowed the longer Agfa box store 6 films upright with no wasted space, unlike only 4 with the other brands.
Also, I wonder if the various types of Agfa slide films used different colours of boxes, since most of mine were/are? not grey but orange - after using CT21.
I used to store exposed films upside down, so a quick look through the transparent lid could show the state of your film 'stock'. If you brighten the screen grab image a bit you can seen he's done what I did too - taped the lid to the box edge - and made a hinge- which saved losing the top. (He's got 2 boxes with open lids, one behind the other.)
If I remember correctly, there was a cheaper brand of tranny film, certainly in Europe called 'Perutz' - which I always assumed was Agfa since it used the same type of slide mounts, boxes, processing, etc. but the Perutz return boxes were black or dark green.
I'm sure you'd pick up the old type of slide boxes at car boot/ garage sales - even allowing for the yellow box domiance in the Americans - but the yellow modern Vari-Air or
Peca Products storage boxes are off good quality and are curved on the bottom so fit the body or a pocket well.
Good hunting.