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warshawlawwhen the cards were printed the sheets were stacked together. On occasion the bottom sheet was not yet dry and the image transferred to the backside of the next sheet. That is why the image on the back mirrors the front image (on the Spahn, for example, note that the "B" in his cap is backwards) and are one color only--only that one ink was still wet. Others are scraps or errors that slipped through the process and onto the market. The strip cards, for example, were probably from sheets that the printer used to check alignment, etc., and were supposed to be destroyed but either were inadvertently sent out or were taken out the back door of the factory by workers.