Franc
The Swiss franc (ISO code: CHF or 756), which appreciated significantly against the new European currency from April to September 2000, remains one of the world's strongest currencies, worth today around five-sixths of a euro. The Swiss franc is used in Switzerland and in Liechtenstein. Liechtenstein retains the ability to mint its own currency, the Liechtenstein franc, which it does from time to time for commemorative or emergency purposes.
Microstates and the European Union
Andorra, Monaco, San Marino, and the Vatican City use the euro through monetary agreements with the EU, and have been granted the right to issue a limited number of euro coins. They were allowed to do so as they had used or been tied to the old eurozone currencies. Liechtenstein, on the other hand, uses the Swiss franc.