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.

PT105.12

Country / Post Portugal
Date of Issue 3 October 2012
Primary theme Architecture (Classical)
Subject Portuguese Palaces - Sintra National Palace
Width 30.6 mm
Height 80.0 mm
Denomination 0.68 €
Number in set 6 (show set)
Layout/Format sheet of 25
Perforations 13 by 13
Stamp issuing authority CTT Correios de Portugal SA
Printer Imprensa Nacional Casa da Moeda
Connect to the web shop of the issuing stamp authority