At the end of the 1960s, the Swiss National Bank completely reassessed its policy regarding the design and production of notes. For the first time, the SNB took over sole leadership of planning, organisation and implementation in cooperation with graphic artists, printers, as well as producers of paper, printing inks and equipment. The basic creative idea upon which the banknote series was based, i.e. the selection of topics and the graphic design, was changed as well. Six banknotes were thus created whose front is dominated by the portrait of a historical personality. The topic on the back of each note is always closely related to the personality depicted on the front. (Recommended reading: The Swiss banknote 1907-1997, Michel de Rivaz, Collection La Mémoire de l'oeil, ISBN 2-88100-080-0)
These banknotes were recalled on 1 May 2000 and are no longer legal tender. They can still be exchanged at the SNB, however, at full face value for 20 years from the date of recall, i.e. until 30 April 2020. (Source : SNB website).