The book cover opens and then can be sealed tight shut with the little clasp
Made of plastic in Germany between 1945 and 1950 - I know this because inside, in tiny writing, is :
GERMANY US ZONE
I have been told that these were used to keep your holy medals safe.
Or
"if you have someone in need of a prayer you used to write their name on a piece of paper and pop it in the case"
But, of course, you can keep whatever you choose inside them.
There are 7 different designs, and several different colours for each design ..
So, the first picture of each design number shows which design that number is,
And the following pictures show which colours that design comes in - these are pictures of the back of the container so you can see the colour clearly.