If it is something you want to play with and what you trade cost you a bunch less than that asking $500 cash, go for it. In 'collector' stuff, condition is EVERYTHING, so 80% doesnt sound like collector quality; shooter, yes.
Hey Swamp, hard to be disappointed in a Skeeter load, aint it! Im glad you got out to play with them. My 3 screw SS is growing on me too; ya'all talked me into it..........