Hi Gaspare

They're kept in mylar sleeves.
I do have a carved WW1 box that houses some, other tan that just stacked here and there.
There is one WW2 photo album that has period photos & cards that are original to the album.

Another Bismarck 'cult' type card to add.

rsz_1p1020416.jpg (94.29 KB, 214 downloads)