I would buy it for say $500. Don't think I'd spend much more on it than that.
What are you basing this on?
Nothing but personal opinion. As I said, that is what
I would spend on a tub that old. When I was buying a used tub I searched for months and months and got a good idea of what the used market was in my area. IMO a tub that old wasn't worth much more than $500, in fact many of them were going for free. I'm not saying it isn't worth more than that, I'm saying that is what I would pay for it. Now if it was at a dealer, came with a limited warranty, brand new cover, and everything else that most dealers include I would have to evaluate that into the price.