there's a little discoloration, nothing on the other side of the paper so
I don't have extensive experience with these, but a lot of the copies I have have imperfections that are hard to ID. I'm assuming these were mass produced with minimal quality control. Very cool/too bad about the OA. I've never been an OA collector, although I would take the original cover are off Avengers 158. I assume that would be beyond cost prohibitive, even if someone put it up for sale, since it's Kirby doing a core title cover. I just love it though.