Admiral David D Porter Double Signed CDV Boldly signed on the front, he again signs on the back "David D. Porter Vice Admiral USN 1868” Back marked O.H. Willard’s Galleries Philadelphia. Porter was from one of the most distinguished families in the history of the U.S. Navy. Promoted as the second U.S. Navy officer ever to attain the rank of admiral, after his adoptive brother David G. Farragut, Porter helped improve the Navy as the Superintendent of the U.S. Naval Academy after significant service in the American Civil War.