Prince Whipple was New Hampshire's foremost black representative in America's Revolutionary War. This U.S. postage stamp, "Washington Crossing the Delaware," issued in Philadelphia, May 29, 1976, is a part of a larger 1851 painting by Emanuel Leutze, which hangs in New York City's Metropolitan Museum of Art. It commemorates Prince Whipple's participation in the American Revolution. (Note: The image on the stamp is at the front of the boat in the larger painting.)
Prince was born in Amabou, Africa, of comparatively wealthy parents, who sent him to America to be educated at about ten years of age, entrusting him to a captain of a ship. The ship's captain carried him to Baltimore, but instead sold him into slavery. He became the slave of Captain (later General) William Whipple--the signer of the Declaration of Independence from New Hampshire. Read more about Prince Whipple at https://www.whipple.org/prince.