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.

ZA112.13

Country / Post South Africa
Date of Issue 12 December 2013
Primary theme Engineering (Buildings)
Architecture (Classical)
Politics & Government
Subject The Union Building Centenary
Width 30.0 mm
Height 30.0 mm
Denomination Standard Postage
Number in set 20 (show set)
Layout/Format miniature sheet of 10 of 10 designs
Perforations 13 by 13
Stamp issuing authority South African Post Office
Printer Joh Enschedé Security Printers