The World Association for the Development of Philately (WADP) and the Universal Postal Union (UPU) jointly conceived and developed the WADP Numbering System - WNS, which was launched on 1 January 2002.

CH031.05

Country / Post Switzerland
Date of Issue 6 September 2005
Primary theme Environment & Conservation
Sport (Outdoor activities)
Subject Centenary of Friends of Nature Switzerland
Width 33.0 mm
Height 28.0 mm
Denomination 0.85 CHF
Number in set 4 (show set)
Layout/Format miniature sheet of 4 of 4 designs
Perforations 13.5 by 13.25
Stamp issuing authority La Poste
Printer Österreichische Staatsdruckerei
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