Erni, Hans.

Portrait of Artur Rubinstein. 

Sketch in black ink, signed by Rubinstein.
[Probably Lucerne,] dated August 8, 1965. 25.8 x 19.5 cm. 
With additional signatures by Nela Rubinstein, Doris Erni, Géza Anda, Hortense Anda-Bührle and others.

Possibly taken from a guest book. - Verso with autograph mus. Dedication of the pianist Sviatoslav Richter, dated  August 2, 1965 and further signatures, including Oskar and Olda Kokoschka.