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.

CH003.11

Country / Post Switzerland
Date of Issue 3 March 2011
Primary theme Mankind (Children)
Literature, Press and Comics (Writers)
Subject Festus and Mercury
Width 33.0 mm
Height 28.0 mm
Denomination 0.85 CHF
Number in set 1
Layout/Format self adhesive sheet of 10
Perforations 13 by 13
Stamp issuing authority La Poste
Printer Joh Enschedé
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