20 years ago that type off error cards was worth what you paid. Now the marked has dropped like a rock on errors. I have 50,000+ error cards from the junk era, back then I could have sold them and bought a nice new house. Now I could maybe buy a new bicycle(cheap) by selling them.
There was supposedly a "chater member" set of these but I do not know how to tell the difference between them as the fronts look exactly like the regular cards and I have never seen the back of one. There is a guy listing a "charter member" card on ebay now, would not hurt to maybe contact them for more info.
http://www.ebay.com/itm/Randy-Johnso...item4ac45d113d
Let me know when you put your stuff on ebay and your ebay ID.