All about the Roland Jupiter-series

http://columbiamo.craigslist.org/msg/864468290.html   I am no
relation, do not know this guy.

He's asking USD $600. That might be a bit high, compared to completed
auctions on Ebay. I see completed ones selling from USD $200-$400.

I am about 15 miles from where it is, so if anybody is seriously
interested, I can go over there and check it out.

 One of the last analogs, it has MIDI, 6 voice polyphony, etc.
http://www.synthmuseum.com/roland/rolju10601.html