10 francs banknote, Switzerland, 1979–1992. Part of the sixth regular series for internal circulation. Issued by the Swiss National Bank.

The obverse features Leonhard Euler — the Swiss mathematician — along with diagrams and scientific schemes related to his work. The reverse depicts a water turbine, optical diagrams, and an image of the Solar System, reflecting the scientist’s contribution to the development of science.

This banknote will be a worthy addition to collections of both beginner and experienced collectors interested in European issues. The scientific theme and the portrait of an outstanding mathematician make it a distinctive representative of the late 20th-century Swiss series.