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HankronI don't know who is the player.
The cliched but correct phrase is, "It's worth what you can get someone to pay for it." Having said that, any turn of the century cabinet photo depicting a Major League player in uniform is rare. If the photo has good eye appeal should be worth at bare minimum $100.
The mount on your photograph obviously has heavy damage, but the player image is sharp. It appears to be a fine photograph to have found at an antique store.