F.I.E. was an importer & imported them in the sixties, maybe seventies also. They're functional plinkers; I have one in .22LR. They're not worth much, though.
Arminius has (was?) been around for a while. I know they used to make tiny velo guns way back when but the F.I.E.-connected guns were low-priced items. I wouldn't mind having one chambered in .22 WMR for knockaround puposes. Got a picture?