Speaking of cereal sets, in 1937 Kellogg's distributed multi-sport stamps inside Pep brand cereal boxes. They came in four-stamp blocks and 24 different blocks were produced with 90 different athletes included (6 players are double prints and appear on two blocks). You will see these stamps for sale in both block and individual stamp forms as the stamps were perforated and meant to be separated and put in an album.
Football stars in this set include Grange, Nevers, Thorpe, Nagurski.

William Shakespear

Red Grange

Howard Jones
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