This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.
A slightly cropped image of a heavily retouched photograph of the USS Spuytin Duyvil, circa 1864. Original found at: http://www.history.navy.mil/photos/images/h75000/h75531.jpg