Gerhard Richter, ”Umgeschlagenes Blatt” 1966 Signed and dated twice on the reverse in black felt-tip pen with the work number: zu Nr. 70 Richter 28.12.66. Marked on the stretcher with a stamp in black: KASACK FRANKFURT A.M 18 × 21 cm Oil on canvas Hermann Kasack, Frankfurt a._M. / Artax, Dusseldorf / Private Collection, Rhineland Portrait einer Sammlung, z.B. Kasack. Frankfurt a._M., Frankfurter Kunstverein, 1978