Don't even think about selling it now, let it's reputation spread a little, it's so rare any collector with the cash would surely want it, give it some time to reach the really rich ones and then put a really high figure on it and set back and wait. Contact the current book writers, Jan Still, Kenyon and others to get pictures of it published with you as the owner, go down in history and get some free publicity. What a find, a once in a life time event, I envy you, like you said, it always happens to the other guy. If Ralph wants it there is money to be had, so sit tight for the time being. Brad Simpson is a big buyer too, see his site at
http://www.simpsonltd.com personally I would sweat them out, it sure as hell isn't going to loose any value by waiting. Right now you have $400 invested, don't make the same mistake the guy at the flea market made, place your bet and let it ride for awhile, you are not going to lose anything by waiting as long as it takes. I recommend you go to the bank and rent a safe deposit box for it unless you have a really good safe at home. Take an armed guard with you, lol.