Andy Warhol (American, 1928-1987) offset color lithograph on rives paper, U.N. Stamp, 1979. Signed lower right. Stamped lower left. Numbered in pencil, 180 of 1000, lower to the center. Framed. Andy Warhol was an American artist, film director, and producer who was a leading figure in the visual art movement known as pop art.