Gabrilowitsch, Ossip. (1878–1936) [Clarke, Mary Dale. (1875–1936)] Signed PhotographOriginal signed doubleweight matte sepia Mary Dale Clarke photograph of the Russian born pianist and conductor shown in a profile portrait at the keyboard, signed and dated "April, 1920." Very fine, 7. 5 x 9. 5 inches (19 x 24. 1 cm.). A student of Rubinstein, Lyadov, Glazunov and others, Gabrilowitsch was one of the first to record for the reproducing piano Welte Mignon (1905) and had a major career as piano soloist. From 1910 14, he was conductor of