Polke, Sigmar Untitled Signed and dated in pencil lower right: Sigmar Polke 98. Signed and dated on the reverse in black felt-tip: Sigmar Polke 98 Private collection, Rhineland (acquired at Galerie Erhard Klein, Bonn) 101,3 x 68,2 cm 39 7/8 x 26 7/8 in. Interferenzfarbe auf schwarz grundiertem Karton 1998