The Fifty Francs coin is a denomination of the Swiss Franc. Given that Switzerland has four official languages, the Franc has three different names: Franken in German, franc in French and Romansh, and franco in Italian.
In regular circulation, the denomination is served by a banknote. These gold coins are non-circulating legal tender made for collectors and struck in proof grade only. They are issued in topical series, celebrating various aspects of Swiss heritage or nature. Swissmint has issued at least one every year since 2001. Initially, both sides of the coin carried a commemorative design; starting from 2004, the obverse is the same and only the reverse changes. (It is worth mentioning that some sources consider it the other way round, and call the commemorative part the obverse; however, we are going with the standard definition, which is that "obverse" is the side which specifies the issuing authority).
The edge is inscribed with the motto DOMINUS PROVIDEBIT (The Lord will provide - a quote from the Bible, Genesis 22, 8), and thirteen stars representing the original thirteen cantons of the Swiss Federation.
This coin commemorates Expo.02 - the 6th Swiss national exposition, which was held from 15 May to 20 October 2002. The exposition took place around the lakes of Neuchâtel, Bienne/Biel and Morat/Murten. It was divided into five sites, which were called Arteplages, due to the proximity of the water (some sites were actually partially or totally built on the water). The five arteplages were located in Neuchâtel, Yverdon-les-Bains, Morat/Murten, Biel/Bienne and on a mobile barge travelling from one site to another. The barge represented the canton of Jura, which does not have access to any one of the three lakes.
According to the organisers, more than 10 million admissions were counted, and the exhibition succeeded in achieving its sole and only goal: the public's pleasure.
Each arteplage was dedicated to a different theme. There was "Nature and Artifice" in Neuchâtel, "I and the Universe" in Yverdon-les-Bains, "Instants and Eternity" in Murten/Morat, "Power and Freedom" in Biel/Bienne and "Sense and Movement" on the mobile platform.