Andy Warhol (American, 1928-1987) U.N. Stamp (F./S. II.185), 1979 Offset lithograph in colors on Rives paper, signed in felt-tip pen and numbered 937/1000 in pencil, with a U.S. stamp, published/printed by United Nations Disaster Relief Organization/United Nations, in excellent condition, framed together with a stamped envelope. 7 x 8 1/2in sheet 8 1/2 x 11in