CASALS, PABLO (1876-1973). Cabinet photograph inscribed and signed ("Pablo Casals"), by M. Büttinghausen, Amsterdam (imprint on mount), n.d. [circa 1906]. 164 x 106 mm. (6 7/16 x 4 3/16 in.) including mount. An early shoulder-length portrait of the cellist, inscribed and signed on the lower portion of the image: "A Madame Ladenburg Souvenir bien sympathique Pablo Casals Frankfurt 1906."