You've heard the "Germans always make good stuff"?
Well, not "always"
This design started out in the 1950s as a toy gun then in the 60's it was turned into a gas gun (kinda like pepper spray) then some idiot thought the design could be further enhanced to shoot real bullets, which it will...once or twice
Seriously, if you have one that hasn't shot itself to pieces yet, it might have some collector value amongst the "Saturday Night Special" aficionados. Yes, their are serious collectors of the genre.
Regardless, I would NOT recommend shooting it, even just a a few rounds. These guns are JUNK!
ETA- A few years ago, I purchased sight unseen, for $200, the contents of a shed owned by a deceased gunsmith's estate who had retired from the business in the 1970s. Among my new treasures was a box of RG Rhom revolvers in various states of disrepair. Seeing that they were made in West Germany, I thought I had a windfall. When I showed them to my gunsmith he showed me several Rhom revolvers in
his own box of junk guns tat weren't worth even trying to fix.