The Frank was the currency of the Swiss

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 canton

Cantons of Switzerland

The 26 cantons of Switzerland are the member states of the federal state of Switzerland. Each canton was a fully sovereign state with its own borders, army and currency from the Treaty of Westphalia until the establishment of the Swiss federal state in 1848...

 of Aargau

Aargau

Aargau is one of the more northerly cantons of Switzerland. It comprises the lower course of the river Aare, which is why the canton is called Aar-gau .-History:...

 between 1798 and 1850. It was subdivided into 10 Batzen, each of 4 Kreuzer or 10 Rappen.
The Frank was the currency of the Helvetian Republic from 1798. The Helvetian Republic ceased issuing coins in 1803. Aargau issued coins between 1805 and 1831. In 1850, the Swiss franc

Swiss franc

The franc is the currency and legal tender of Switzerland and Liechtenstein; it is also legal tender in the Italian exclave Campione d'Italia. Although not formally legal tender in the German exclave Büsingen , it is in wide daily use there...

was introduced, with 1½ Swiss francs = 1 Aargau Frank.
Billon coins were issued in denominations of 1, 2, 2½ and 5 Rappen, ½ and 1 Batzen, with silver coins for 5, 10 and 20 Batzen and 4 Frank.