Well, according to VCP they list Tris Speaker appearing on the following items listed with dates before 1910:
1907 Novelty Cutlery Postcards as you mentioned
1908 Rose Company Postcards
1909-1913 M101-2 Sporting News Supplements
1909 E90-1 American Caramel
1909 Boston Sunday Post Supplements
1909 E254 Colgan's Chips Stars Of The Diamond
1909 PX7 Sweet Caporal Domino Discs
Plus, they also list all of the T206's as 1909.
Hope this helps.
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