History of Switzerland
Switzerland's most important exports during the war were precision machine tools, watches, jewel bearings (used in bombsights), electricity, and dairy products. During World War Two, the Swiss franc was the only remaining major freely convertible currency in the world, and both the Allies and the Germans sold large amounts of gold to the Swiss National Bank. Between 1940 and 1945, the German Reichsbank sold 1.3 billion francs worth of gold to Swiss Banks in exchange for Swiss francs and other foreign currency.
Fribourg gulden
The "Gulden" was the currency of the Swiss canton of Fribourg until 1798. It was subdivided into 14 "Batzen", each of 4 "Kreuzer" or 16 "Denier". It was replaced by the Frank of the Helvetian Republic in 1798. This was, in turn, replaced by the Fribourg Frank.