Jim B- it's clearly a cabinet photograph and the image looks albumen, so that places it in the late 1800's, the era when they were issued. The ones from the late 1880's have uniform looking and somewhat plain mounts. By the early 1890's, more elaborate designs were being seen. So by the mount I would date it early nineties; and there is nothing in the photograph, including the uniform style, that disputes it. And I think by 1900, the cabinet mounts changed yet again. So that's how I came upon my estimate.
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