600 is cheap! I just did mine three weeks ago for $800! That was the cheapest in town too! Also, is your truck 4X4? If it is, like mine, that's why! (lots of stuff to remove)
Tricky question. On one hand it has a good reputation for being a nice touring frame of good quality. OTOH it's old, and not all that rare. USD600 sounds high, particularly if it still has the original drivetrain, but I've seen them sell for 300+ USD. ANything a bit special like that, the value is whatever the buyers currently interested think it is. For someone who sees it as "just another bike" it might as well be USD 100, or less.
Just don't use Wecoochem or RCChem. They are a bunch of Chinese scammers. They will take your money and not deliver the goods. Beware of Wenchao Wu or Kevin Allen from the mentioned "companies". I lost close to USD600 out of ignorance and trust. Noway of getting it back now. BEWARE of dealing with sellers, particularly Chinese sellers, of Nembutal online.
Avoid buying something so critical online. In particular, stay clear of Wecoochem and RCChem. They will take your money and not deliver the goods. They stop answering emails after you have paid them. Beware of Wenchao Wu or Kevin Allen from the mentioned "companies". He/She uses the following email addresses: chao305866131@msn.cn, chao305866131@hotmail.com, sales@wecoolab.com. Take care. I lost close to USD600 out of my ignorance and trust. Noway of getting it back now. BEWARE of dealing with sellers, particularly Chinese sellers, of Nembutal online.