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davidcyclebackGood guess is that it was shot by either Horner, who photographed many of the T206s portraits, or Benjamin J. Falk. Falk photographed Giants players and his images were used on cards. Some of the non-sport 1890s Newsboy Cabinets are by Falk. Horner's 'T206' cabinets are around. I've seen the Wagner, Chance, Joss, etc, but don't recall seing a Mathewson.
It has been said that Walter Johnson's T206 pitching pose doesn't facially look like Johnson.