You are much more likely to find game moments prior to 1920 depicted in RPPCs taken by fans than professional photographers. Cameras for the common man were all the rage during the Deadball Era. Here is a link to a thread providing the details about a game action RPPC depicting the key moment in the 9th inning of Game 3 of the 1912 World Series at Fenway.
http://www.net54baseball.com/showthread.php?t=241403
1912 World Series postcard.jpg