Polke, Sigmar Untitled (Streifenbild) Signed and dated lower right with felt-tip pen in brown: Sigmar Polke 98. Signed and dated on the reverse: Sigmar Polke 98 Private collection, Rhineland (acquired at Galerie Erhard Klein, Bonn) 101,3 x 68,3 cm 39 7/8 x 26 7/8 in. Interferenzfarbe auf Grau grundiertem Karton 1998