Dr. Carl Robert Rudolf, London; [London, Sotheby's, 19 May 1977, p. 45, lot 167] (1977 ); [P. & D. Colnaghi and Co., Ltd., London]; Dr. Carl Robert Rudolf, London (Lugt Suppl. 2811b, stamped in black ink on fragment of an old support now glued to CMA mount); [his sale, London, Sotheby's, 19 May 1977, p. 45, lot 167] (photocopy in department file). [P. & D. Colnaghi and Co., Ltd., London] (not published in any catalog]