Not to be insulting, but no one in that photo closely resembles Rube Foster. There are zillions of Foster photos available for comparisons.
Will Horn played for the Leland Giants in 1905 and possibly 1906, but not in 1907. Could be that he was barnstorming with the Union Giants in 1907, wearing the last uniform he owned - from the 1905 or 1906 Lelands (reference books say he retired after either 1905 or 1906).
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