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.

ES025.11

Country / Post Spain
Date of Issue 7 February 2011
Primary theme Science & Technology (Physics & chemistry)
Subject International Year of Chemistry
Width 40.9 mm
Height 28.8 mm
Denomination 0.35 €
Number in set 1
Layout/Format sheet of 50
Perforations 13.75 by 13.75
Stamp issuing authority Correos Y Telegrafos SA
Printer RCM-FNMT
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