This is called a "wet sheet transfer" and is common in many sets. It occurred when the printer stacked two uncut sheets of cards on top of each other. If the ink on the back of the top sheet was not completely dry, some of that ink would transfer onto the front of the lower sheet. I prefer cards without a wet sheet transfer, but some like the novelty of it. It also occurs on the back of cards where you can see a "ghost image" of the front of the card that was lying below it. These often carry a premium.
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