The grip says RG10 and the barrel says 22 SHORT and MADE IN GERMANY. This belonged to my wife’s grandmother who died 14 years ago at 75 years old. (Born in 1929). The serial numbers on the barrel, cylinder and the frame all match and it does shoot.
I know it is probably worth less than the Glock mat it is sitting on. Apart from that, I know nothing about it. Because I’ve never seen it before, I thought I’d share. If you know anything more, please share.