The Frank was the currency of the Swiss canton of Thurgau between 1798 and 1803.
The Frank was the currency of the Helvetian Republic from 1798.
The Helvetian Republic ceased issuing coins in 1803.
But the main currency in the Canton of Thurgau between 1803 and 1850 was the South German Gulden.
This article about a unit of currency is a stub.