The Principality of Liechtenstein and Switzerland are closely bound to one another by economic, regional and friendly ties. 29th March 1923 saw the signing of the customs treaty with the Confederation under which Liechtenstein became part of the Swiss customs area. Since then Liechtenstein’s foreign policy has to a large extent been determined by the agreements stipulated in this customs treaty. But this was readily accepted: from then onwards Switzerland proved itself an extremely reliable partner.
The "Switzerland-Liechtenstein Customs Treaty 1923-2013" jubilee double stamp shows a view from a helicopter positioned above the southern national border. The central and unifying element is the Rhine, weaving its way northwards through the Rhine valley. To its left, on the "Switzerland" stamp, one can see parts of the Eastern Switzerland Rhine valley and the Gonzen; on the right-hand "Liechtenstein" stamp one can see the Ellhorn and, in the background, the Liechtenstein valley region. The aerial photograph was taken by the Liechtenstein photographer Marco Nescher; both stamps were designed by Stefan Erne.