Blank firing adaptor

[technova]

Here is the European BFA. They have been around since the 1970's. I have several hundred of them but have severe restrictions on how they are purchased, for safety reasons.

That's what mine looks like, it has a date of '54 or '58 on it and what looks to be a Danish crest.
Nice to know what it actually was, never got the chance to ask my Dad.