I was surprised to find that I was the only one to bid on it on eBay. I've been looking for information and the only thing I've found at all is a model JZ that looks just like it, but no one seems to know anything about that one either beyond that it was made in Germany
I'll post pictures when it arrives and test drive notes but for now I'm just trying to learn as much as I can while I don't have it in hand.