This is a Offset Lithograph ON WOVE PAPER by Roy Lichtenstein, titled "Crak! ". The overall size of the Offset Lithograph measures 21 x 28.5 inches, with an image size of 18.5 x 27 inches.
Here are some additional details about the item: Original Exhibition Poster for Leo Castelli exhibition Sept. 28- Oct. 24, 1963. Corlett no. II.2.C, Bianchini (1971) cat. no. 5, Zerner (1974) cat. no. 7. Published by Poster Originals Ltd.