I'm familiar with the football issue of these cards. Not much is really known how they were distributed -inside boxes of Corn Flakes, or part of the box like the Post Cereal cards. The edges have perforation tabs as if they were attached to something. They were promotional items for the SI posters. That's why the #'s match their larger counter parts -the posters. They are a little smaller than a standard-size card and are blank-backed.
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