Well 40 years ago nobody was really aware of the "Elite 11" that includes Mullin (horizontal) and Schaefer with Piedmont 350 backs. I could never understand how those were so hard to find but I finally did get them. Some of the Tolstoi backs are really tough too, Rossman and Willett. Otherwise I think your only difficulty now would be the price for tough backs and Ty Cobb cards.
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