I have a nice original Groetchen Liberty that is complete except for the coin chute that attaches to the back door (photo below).
It was also used on the Sparks Champion and maybe other model Groetchen trade stimulators as well.
It consists of 2 parts; the back plate and the front plate with swing arm attached to lower end.
Anyone with a parts machine or trade stimulator "junk pile" that has this available, please advise.
