I've just seen your post on the Danish 1963 emergency stamp.
I enjoyed the article by Otto Hornung.
(I wish we could have discussed some of our Ottoman questions with the great man.)
It reminded me that I had a couple of the folders containing the stamps that were made available as he described.
Here are the front and back of one of the folders.
It's about the size of postcard:
"Folder" is perhaps too grand a word for this as it's basically a printed card that's been folded once.
There is more info on the inside along with one or more mint stamps in a glassine envelope stuck to the card with a sticky label.
I have one with one stamp and another with a horizontal pair of stamps.
The image on the front appears to be the one in your post.