Okay, so now you have me doing it too! I am starting to study all the cards I get and look for variations. This is what I found last night(quite by accident actually) when I pulled two of them out of my pocket and noticed a color variation. Further inspection showed that indeed the bottom card was both a shade darker and also did NOT have the plasticard.com logo on the back upper left hand corner. As they are long obsolete, I do not have oodles to sort through and compare for more variations, but the two I had in my collection turned out to be the same way. I have one trader of each if anyone is interested. Thanks