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.

DZ024.06

Country / Post Algeria
Date of Issue 20 December 2006
Primary theme Environment & Conservation
Engineering
Subject Water Desalination
Width 40.0 mm
Height 30.0 mm
Denomination 20.00 DZD
Number in set 1
Layout/Format sheet of 25
Perforations 14 by 14
Stamp issuing authority Algerie Poste
Printer Imprimerie Banque Centrale D'Algerie