After Roy Lichtenstein (American, 1923–1997), "Whaam!" 1967, offset lithographs in colors on two sheets of wove paper, bearing a signature in pencil on the right sheet, copy 3M682, from the edition of 3000 published in 1986 and 1988, published by the Tate Gallery, London, sheets (overall/unframed): 25"h x 29.5"w. Reference: Corlett Appendix 7