signed by artist, lower right, in graphite; by later hand, verso lower left, in graphite: M41 575 / 605 / 403
Marks and Labels
stamp, verso lower center, in black ink: RCK
(Kunsthaus Lempertz, Cologne, December 7-8, 1984, lot 403); Ruth Kainen [1922-2009], Washington, D.C. (Lugt 4740); Gift to NGA, 2012
- Rathenau, Ernest. Im Memoriam Paul Gangolf. Berlin: Euphorin Verlag, 1964, no. 18.