Which of these European countries does not use the euro as its official currency?

The Swiss franc is the currency and legal tender of Switzerland and Liechtenstein. It is also legal tender in the Italian exclave of Campione d'Italia. The Swiss National Bank (SNB) issues banknotes and the federal mint Swissmint issues coins.

Cyprus, Ireland and Malta use the euro at their currency.

The Swiss franc has historically been considered a safe-haven currency, with a legal requirement that a minimum of 40% be backed by gold reserves. However, this link to gold, which dated from the 1920s, was terminated on 1 May 2000 following a referendum. By March 2005, following a gold-selling program, the Swiss National Bank held 1,290 tonnes of gold in reserves, which equated to 20% of its assets.

In November 2014, the referendum on the "Swiss Gold Initiative", which proposed a restoration of 20% gold backing for the Swiss franc, was voted down.