If it's real photo (no dots in image), it's an early 1900s cyanotype real photo postcard. Cyanotype was a photo processes known for its blue (cyan) image and was used to make some real photo postcards and snapshots. Baseball cyanotypes are scarce but not rare. The uniforms are early, so the date would be close to the 1907 divided back starting date.
Last edited by drcy; 10-05-2015 at 12:13 PM.
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