Sorry, no offers to sell here. Masked as a question or not. Move to the swap meet. That's the rule here. Not my rule.
You will get huge ranges anywhere you ask. It depends on where you live, where you advertise, condition and a bunch of other things. Check Ebay sales, local craigslist, NADA, KB, etc. and you still won't know. The uncle owns it because he likes 60-66, knows about them, worked on them, he has an idea. He has not lived in a vacuum. I've seen folks pretend they don't have a clue so they can get offers, trying to catch a fish.