Evocative original postcard photograph of the great violinist entertaining American troops during World War I, captioned "Mischa Elman playing for the soldiers at the K. of C....Sounding Shell, Camp Kearney, Cal."  An unknown hand has written and addressed in pencil to verso.  Crease to bottom right corner, nicks to edges, some staining around upper and left edges, else fine. 8 x 6 inches (20.3 x 15.3 cm).