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.


Country / Post Portugal
Date of Issue 18 September 2017
Primary theme Architecture (Classical)
Subject Tricentenary of the Beginning of Construction of the National Palace of Mafra
Width 80.0 mm
Height 30.6 mm
Denomination 0.50 €
Number in set 2 (show set)
Layout/Format sheet of 20
Perforations 13 by 13
Stamp issuing authority CTT Correios de Portugal SA
Printer bpost
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