Based on the back it is a pre-1907 postcard as it is undivided and the style of AZO back is consistent with that. That being said I would have a very hard time blieving this is from before 1905-1906 based on Wagners age in the photo. That does look like Butts on the far left seated (I haven't done much research into it though) so it could just be a photo of friends from their hometown or something along those lines, may not be baseball related (but it could be).
-Rhett
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