My wife found her papaws old revolver the other day. It is a Rohm .22 RG10s. I know these were not high quality revolvers or even worth much. What I'd really like to do is just date it. I've read where the german models were dated with 2 letters and american made had different date codes. I did find an odd "64" stamp but from what I've read, american models weren't made until 1968. I've attached best pics I can get of the markings. Anyone have any knowledge of possible date? Thanks for any help! Bobby