I think these were offered in a Mastro auction about '97, but haven't seen any since. During that time there have been at least 2 each (and possibly a 3rd set) of Stanky/Konstanty/Roberts, a half dozen or so '60 Fleer #80's, a lot of '60 Leaf big heads, and plenty of other regular issue variations (Herrer, Maris Proof, Bakep, etc)
Are the '60 Topps "proofs" the toughest regular issue variation?
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