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Frank WakefieldFrank Wildfire Schulte played with the Chicago NL, Pittsburg NL, Philadelphia NL, and Washington AL. He was with Philadelphia for 64 games during the last half of the 1917 season. So that would be a 1917 photo.
If you were really wanting to nail down a date, get someone to look through Philadelphia sports pages during July, August and September of 1917, looking to see when Stock had a son born.
http://www.baseball-reference.com/s/schulfr01.shtml
That is the link to Baseball-Reference.com's schulte page. And somewhere I have a book that lists trade dates, if you really want to know the time frame he was in Philadelphia. He was with Washington for 1918.
You're fortunate that the photo has made it down generations to you. Gotta scout out someone younger to pass it on to, someone who won't pitch it or sell it. Aren't we all a bit curious about what will eventually happen to our cards, books, and stuff...