Fourth banknote series, 1938
During the Second World War, the Swiss National Bank commissioned the two painters Victor Surbeck and Hans Erni to design new notes. While the 1000-franc, 100-franc and 50-franc notes went into print, the 500-franc note did not progress beyond the proof stage. None of the notes were ever put into circulation. (Recommended reading: The Swiss banknote 1907–1997, Michel de Rivaz, COLLECTION LA MEMOIRE DE L'OEIL, ISBN 2-88100-080-0)