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fkwJoann, Ive thought the same exact thing about these cards when I first picked some up. At one time I had 11 of them and at least 3-4 have the same wet sheet transfer on the front. I always thought It might be that this find of 69 cards were all stacked on top of each other and wrapped tightly for many many years and the ink transfered from the pressure.
I had a couple thousand 1984 Oakland Invaders bumper stickers with ads printed on back that this happened too.