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John Martinkovic - 1957 Topps #142
There is a nice array of photos of John Martinkovic on the Packers Hall of Fame web site. The last image looks like a prototype for a 1955 Bowman football card. Martinkovic did not appear in the 1955 Bowman set, but compare the image to Floyd Reid's card.
Estimated value: ex $6, nm $22
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