There is no photographer's mark or identifications front or back. The image is sepia with EXTRA FINISH (lightly glossed). The Indian on the left wears a buffalo horned and buffalo skin headdress. The Indian on the right has a full feathered headdress. They are both decked out in their finest. Also note that the Indian on the left wears the Star badge of an Indian Policeman. That aspect makes the image even rarer and more valuable. Dating is circa 1885-1895.