Most of the mainstream football sets don't have a difficult series. Bowman's 32 card series never really produced a tough one (54 series 3 is probably the toughest relative to the others within a set), and Topps 1-2 series release schedule makes the second series less common but still abundantly available. Other than 1972 Topps 3rd series, I cannot really think of a difficult high series in mainstream football
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