Clarke
Personally, I think it looks like Fred Clarke. Clarke batted left handed and was on the Pirates in 1908 (in my experience - the simplest and most likely answer is usually the right one).
I have included a picture of Clarke batting (unfortunately - it is from his front side). To me the stance looks the same as the original photo - left arm tucked in, leg position, and he has a prominent nose as well.
I hope it can be proven to be Wagner for the owner - that would be a cool item.
But in my opinion its Fred Clarke.
Andy
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