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boxingcardmanIf you are talking about the PC backed set, it shares images with W517 (including caption lettering--which is in the same hand) so someone could mistake a W517 mini as a cut from a 4 on 1. Also, with regard to the very first group of 4 on 1s issued (the ones with the handwritten labels), some cuts have been mistaken as strip cards. See my site for more info and some examples.
http://imageevent.com/exhibitman/interestingexhibitcards
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