Bryan, according to a postcard website that stamp area that says 'azo' with 4 triangles dates from 1904-1918. The split back typically means after 1909 (I believe) and the catcher's mitt looks 1909+ too. The car seems like 1915 but I'm just using my instincts there.
I'd say your card is 1914-16. But it could be 1910+ too.
Hope this info somehow helps.
Peter
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