Autograph signature from the German conductor and composer, known for his 37-year tenure as music director of the Chicago Symphony Orchestra, together with a small signed clipped halftone photograph. Stock has signed boldly on a trimmed piece of manuscript paper, and again in white ink on the photograph, adding "Cordial greetings!" The photograph has been tipped to the right of the signature. Slight toning; in fine condition overall. Total size 8 x 3.5 inches (20.2 x 8.7 cm).