Roy Lichtenstein (American 1923-1997), 'Whamm!!', 1963, diptych, offset lithograph in colours on Huntsman Superwhite Cartridge paper, published by The Tate Gallery, printed by Lautrec Photo Lito Ltd Leeds, bearing printed title, date and publishing information to the lower edge of both sheets, from an un-numbered edition of 3000; sheet: 64 x 74.5cm each; total image: 64 x 149cm (2)