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fkwThe one in my post above (on left) is a San Francisco back. I have it in my hands right now, Im 99.5% sure it is authentic. Lately I have been looking at every single Ruth Candy card, looking for differences, and have noticed there are a lot of variations is the cropping of the photos and the caption print. I know there is a blank back, a Cleveland Back and a San Francisco back. I have owned all 3 types of backs in the past but never of the same card #. This set needs to be reserched a bit more.
edited to add photo

Notice how this Ruths photo was cropped differently, On mine you can see more of his pants below the belt at bottom. but on yours (above) you can see it has more room above Ruths head. So I believe both are authentic, just variations, as they do have different backs.
Frank