I saw one sell at an auction about 7 or 8 years ago for $11,500. It had been sitting on the trailer for 6 or 7 years, the engine (gas) was locked up, 4 of the tires were flat (all were new when it first arrived, by then all the tires were dry rotted badly). The guy who bought it was from Kentucky, the auction was in east central MO.
About a year before, a friend of mine had sold his. It had about 50-60 hours on a rebuilt engine, chain boxes had been rebuilt 2 or 3 years before, decent rubber (truck tires), daily worker. He sold it for $5500.
It is worth whatever you are willing to give for it. (My opinion)
Hope this helps,