In 1923, Switzerland signed a customs treaty with its neighbouring principality. By virtue of this alliance 100 years ago, Liechtenstein became part of the local economic area, introducing the Swiss franc as its official currency in 1924. The treaty stipulates that no taxes may be levied and no restrictions or prohibitions on imports and exports may be enacted by either side. The celebrations for the anniversary of this close association include the issue of two stamps, and the Swiss design is entitled “Relationship”.

It features a zip symbolizing the links between the two countries and the closeness created by the long-standing alliance. A second element is the Rhine – a natural border that was bridged by the customs treaty. The Liechtenstein design – “Friendship” – focuses on the historical significance of the long-standing relationship and depicts elements from the original treaty.