Hard chip to rate. Jim Gellette had some. I felt about 10 was all but could of been a few more I feel now. Now his nephew Al has some he got from Jim's estate. I think he runs one on ebay every now & then. About a $400 area. I only know Jim always had one to sell. I would guess an R-8 but will try to keep up with it & the sales if I see any.
Another name has been found too! Sy Geller.