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.

PT108.12

Country / Post Portugal
Date of Issue 9 October 2012
Primary theme Mankind (Children)
Subject School Mail
Width 30.6 mm
Height 40.0 mm
Denomination 0.32 €
Number in set 3 (show set)
Layout/Format sheet of 50
Perforations 13 by 13
Stamp issuing authority CTT Correios de Portugal SA
Printer Joh Enschéde
Connect to the web shop of the issuing stamp authority