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RobertSI’ve seen this postcard with a postmark from 1907. Also, I have a picture of this card with the names listed (although I don't have the actual card and the picture isn't post-able). The names I can make out are as follows:
Top Row,
?, Groh, Robertaille (possibly), ?, Hulswitt, Freil, Coulter, ?
Bottom Row:
Ryan, Flaherty (although the name Berger is also written below), Wrigley, Clymer, Veil, ?, Pickering
Here's an image containing another example of your postcard together with a companion gameday scene card from this Columbus Dispatch series:
Close-up:
And here's an image of a 1907 Columbus team postcard (I've always wanted to find this card for sale, but it rarely comes up):
Also, here's a link to a good history of the 1905 team: http://www.minorleaguebaseball.com/app/milb/history/top100.jsp?idx=59