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.

AO002.03

Country / Post Angola
Date of Issue 21 August 2003
Primary theme Aviation (Aviation Pioneers)
Subject Centenary of the First flight of the Manual Engine
Width 40.0 mm
Height 30.0 mm
Denomination 25.00 AOA
Number in set 1
Layout/Format miniature sheet of 3
Perforations 13 by 13.3
Stamp issuing authority Empresa Nacional de Correios e Telegrafos de Angola
Printer Cartor Security Printing