Cards from this classic set were found on the backs of Post cereal boxes. Due to the fact that some cereal brands were less popular than others, Post did not print the same quantites of each box panel, giving us four Cowboys in this set with short print designations. This set is actually larger than the Topps set from the same year by 24 cards. If you don't count the checklists and team cards from the Topps set, and only count players, it's 40 cards larger.
Full box panels are very rare, especially those that were known to be a less popular brand of cereal. The seven card box panel was the most common variety, while the smaller panel with four cards was from a 12oz box.
