I'm not sure if I'm repeating what Steve already said, but my basic guess would be that the lower left corner of the sheet on top of the one containing this card was 'missing' (for lack of a better word) and the ink got printed on this sheet by falling through the cracks, so to speak (just in the missing corner). Then the sheet itself was printed and that corner (aligned perfectly, because nothing changed between the printing of the sheets) was double printed, causing the charcoal look to it. Seems very plausible.
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