The prices for these Star Wars posters are holding up.
I was interested (but not surprised) to see the commercial Coca-Cola advertising posters commanding prices in the hundreds still, as these are not commonly available.
A perfectly mint, fresh Chaykin can fetch $1200-2000, depending on the number of people going for it. I think the $670 ending price is reasonable considering the border stains and two small edge tears on the poster. Framed, it wouldn't make a difference since the image art is still good. And if the image portion is still fresh and vibrant like new, that price is a steal. If not, then I think it's the right price for it.
I am surprised, though, that the B1 Advance didn't sell, but, then, you'd have to be a die-hard collector to go for this one since it is not a pretty poster. I haven't actively pursued it precisely because I know I'd never hang this one up. It would be interesting to have in a Star Wars collection or to have so that a collection can be complete, but aesthetic wise it's ugly. If only Ohrai had designed it instead.
Jeannie