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Anthony N.File copy perhaps- like the '56 Bowman prototypes, or the '33 Goudey #106 Durocher. Or like Ted says, a first run that got changed and an employee grabbed it.
Makes you wonder if there are any more like this, and if Leaf planned the 2nd series at the same time as the first, which card got swapped out for Newhouser?
Peterson, Blackwell and Hudson are the only ones with this background color, but Hudson is the opposite as this one, in that the yellow is bigger on top.