Image of "Big Man" Copyrighted 1903, F. A. Rinehart, Omaha, Nebraska. Card mailed September 10, 1905, Yellowstone Park, Wyoming. One cent postage applied upside down. Mailed to Oxford, PA. Note on the card: "This is my Western Friend. --- LEW"
This may be a fairly rare image given that it does not appear in the first few hundred results in a Google Images search "Big Man Native American".