Not a super esoteric item but I bought this 1958 Sport magazine out of a bargain bin at a Gloria Rothstein show circa 1995. It was from one of those guys who used to set up with the cardboard boxes full of random signed magazines and photos. I was only 10 or 11 when I picked this beauty out. I had a pretty good eye even then and before authentication existed.
Still trying to forgive myself for the JSA sticker: