TxBuilder is right.
Don't mess with it.
I've seen too many American Picker, Pawn Stars, and other shows like that. It seems like most of the time you reduce the value of something old by "trying" to restore it.
I would try Craigslist first and repost the ad a few times over the next month. You'll probably get more money by avoiding the eBay and Paypal fees.
Good luck