I saw this at a local auction house today:
I did a quick search and found it was a 1970's or 80's Sachs Hercules P1. Here are some photos from the web:
And here is a website with info. (yer gonna have to use google translate or something.)
Is something like this worth buying ? It is non functional at the moment, and seems to be complete minus the grip on the right hand side. I don't know if the grip also functions as a throttle.