Composition grise, verte et bleue. 1966. Lithograph in colors. Poliakoff/Schneider 54. Signed and numbered. From an edition of 50 Roman numbered copies. On wove paper by BFK Rives (with watermark). 48,3 x 62,7 cm (19 x 24,6 in). Sheet: 63 x 80 cm (25,6 x 31,2 in). Printed by Erker-Presse, St. Gallen (with blindstamp). Published by Kunstverein St. Gallen. [JS].