There have been a few sold on the Forum and eBay that were in similar used condition and ranged from $400-600. That’s a pretty wide range... but I think $400 is basically the floor and given yours is intact with basically discoloration/fading I think $500 ish is reasonable. Nice color and clear picture/print and this jumps $600-800. Hope that helps as a guide, but there are obviously multiple factors that could increase the price. You have the supply, which is the hardest part.