In 1920 stereograph production was discontinued and Underwood & Underwood sold its stereographic stock and rights to the Keystone View Company. The Keystone republished images included a V prefix for Underwood source. An example would indicate K24056 as Keystone numbered and the same images V24056 as Underwood and Keystone dual copyrighted.
Published
No. (57) - 445. Reverse has descriptive notes.