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.

PT081.12

Country / Post Portugal
Date of Issue 30 July 2012
Primary theme Geography & Meteorology (Seas, lakes & rivers)
Subject The Douro River
Width 40.0 mm
Height 30.6 mm
Denomination 0.57 €
Number in set 5 (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