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Got this one in the Book "Baseball Uniforms of the 20th Century" by Marc Okkonen..

The senators uniforms were similar in 07 and 08 but differed as they had a white collar and the socks were blue with a white upper stripe... in 09 it looks like the uni's changed slightly (Blue Collar, stripe down side of pants, and a solid white colored sock)...

According to this book I would have to say that you picture dates to 1909... Awesome piece!