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AlOk, I am familar with those. They are like the 67 Maris, blank back proofs never put into production. Hadley with A's logo and Cimoli with Cardinals logo are confirmed, but Thronberry in a Yankees logo is, as far as I know, unconfirmed. If these things ever show up, I predict they will rival the prices for the 51 Konstanty, Roberts and Stankey