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steve fLooks as though the actual photo is intact that just the backing/cabinet is cut? It doesn't look like Hickok or any well known Union or Confed generals, but there were hundreds of generals I believe. That face does look familiar (Molly Hatchet concert in '78?). Send along a scan to Dr. Farley at the Civil War Museum in Richmond. Keep us posted.
If it's a ranking officer, he'd know it. lkeenerfarley@nationalcivilwarmuseum.org