At first glance the batter looks an awful lot like John McGraw during his playing days, or early playing/managing years.
So I looked up McGraw on Wikipedia and there's a photo of John at the plate conferring with the umpires and a A's player. The A's player looks alot like the player in your photo:
http://en.wikipedia.org/wiki/File:Co...rld_Series.jpg
If anything, this may at least tell you it's an A's player from 1905, from the uniform alone.
Graig Kreindler should weigh in on this one!