Eric,
According to Dressed to the Nines, the HOF uniform database, it appears as though it's a 1929/1930 away uniform:
http://exhibits.baseballhalloffame.o...rement=9&pos=1
And it was not unusual to convert a photo into a postcard so the person who took the photo probably had a few copies made to give away. Nice pickup!
Hope this helps!
Happy New Year,
Mike
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http://t209-contentnea.com
Buying 1905-1915 Southern League cards, PCs, & memorabilia / T210: Series 2, 3, 4, 6, 7 & 8