Thanks for the pics. I’ll say the tired, simplistic cliché that ”it’s worth whatever someone is willing to pay”, and that might be a little more for someone like MPeed because he’s all about the nostalgia and he had one as a youth. It’s like some Holy Grail.
This particular K-C brand is obscure and is working against the value, but at least it’s rare as JimD said. It’s not a Rupp kart unfortunately so you’d be hard pressed to find a buyer willing to shell out 1,000 clams. Has there any been sold on BringaTrailer?
However, if I bought it, I would be the caretaker of it (for the next guy) and might “restore” it as much as it is feasible. Be neat to have those decals reproduced. There’s one, albeit small, on page 3 of that brochure plus MPeed to give you dimensions of the one on the Nassau panel…… . . . . .