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.

DZ001.19

Country / Post Algeria
Date of Issue 2 January 2019
Primary theme Science & Technology (Physics & chemistry)
Subject International Year of the Periodic Table of Chemical Elements
Width 43.0 mm
Height 29.0 mm
Denomination 25.00 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