Leon, just to clarify the card back I show above is that of one of the Car Series cards NOT the "stamped" baseball series spoken of here. I was simply pointing out hat Neilson's made a set of cards on thick paper stock roughly the same size as a W572, that all.
I have copied the image of the back of the "stamped" baseball series from the SCD (I hope Bob Lemke doesn't mid) below. This is the back whose authenticity is being questioned...
