Wagner, Siegfried - Autograph Note Signed

German composer and conductor (1869-1930), he was the son of the famous opera composer and the Artistic Director at Bayreuth Festival from 1908 through 1930.  Autograph note signed on a postcard about an appointment after a performance of Parsifal, not dated (postal service ink stamp indicates july 13th, 1908).  Size is 5.5 x 3.5 inches, in excellent condition.