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barrysloateI think the Ty Cobb back was part of a short-lived promotion within a small geographic area in the state of Georgia. Due to the popularity of the T206 set, the company realized by duplicating the look of a T206 the Ty Cobb backs would be eagerly sought, thus promoting the brand.
I think it was a point of purchase thing: buy a pack (or tin) of the Ty Cobb brand, and the tobacconist would hand you one of the cards. It had to be a relatively small promotion, based on the few surviving examples today.