Neat image. My best guess is that it's not a professional league team--the name "American" would be a little odd in any professional context I could imagine. I'd think it's some sort of industrial league team representing a company with a name like "American Tool & Die" or maybe even a newspaper--The American Standard. For every old photo of a pro team there are scores of amateur shots, so from a pure numbers standpoint it makes sense as well.
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