Signed postcard photograph of the renowned American violinist who premiered the violin concertos of Alban Berg and Arnold Schoenberg and who was a close associate of Webern. He is shown in a portrait by Fayer of Vienna, and has signed and inscribed at the lower right: "To S. H. Porter / Louis Krasner / London BBC / May 1, 1936." Slightly poor contrast to the inscription, one slight crease; overall fine. 3.5 x 5.5 inches (8.5 x 13.2 cm). Scarce.