For a long time collectors have considered the Dietsche postcard to be Cobb's rookie card, but with several postcards originating from 1907 it is almost impossible to designate one definitively. I think it will always remain open-ended.
As far as actual cards E102 is thought to have been issued in 1908, and thus his very first small format card. But I bet even that has been challenged. Cobb is one of the toughest players to have a consensus on what his rookie card is.
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