Front of the 20 Swiss Francs banknote, part of <a href="https://en.wikipedia.org/wiki/Banknotes_of_the_Swiss_franc#Fifth_series" class="extiw" title="en:Banknotes of the Swiss franc">5th series of Swiss banknotes</a> (in circulation 1956-1980). Depicts General <a href="https://en.wikipedia.org/wiki/Guillaume_Henri_Dufour" class="extiw" title="en:Guillaume Henri Dufour">Guillaume Henri Dufour</a>
Swiss National Bank/Hermann Eidenbenz
digital image kindly provided by the Swiss National Bank