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.

ZA004.06

Country / Post South Africa
Date of Issue 2 May 2006
Primary theme Medicine
Aviation (Aircraft)
International Organisations (Red Cross & Red Crescent)
Subject Medical Outreach to Rural Areas in South Africa - SA Red Cross Air Mercy Service
Width 47.5 mm
Height 30.0 mm
Denomination Standard
Number in set 6 (show set)
Layout/Format sheet
Perforations 13.5 by 13.5
Stamp issuing authority South African Post Office
Printer Cartor Security Printing