A little book, 3.5cm tall, 3cm wide.
With a little clip so you can open and shut it...
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"
