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fkwI have seen a couple complete sets on eBay in the pannel form like your cards, but they are scarcer than the individual cards. I usually find them in nonsport paper categories. The cards were originaly found on back of "40% Bran Flakes" boxes ca.1930. The set is known as the "Famous North Americans" set, and Mathewson is only baseball player. As far as a Co. that would grade it, I dont know of any (good ones) that grade large handcut panels like that. Good luck. Frank