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.

LK003.11

Country / Post Sri Lanka
Date of Issue 30 January 2011
Primary theme Science & Technology (Physics & chemistry)
Subject International Year of Chemistry
Width 30.0 mm
Height 60.0 mm
Denomination 5.00 LKR
Number in set 1
Layout/Format sheet of 50
Perforations 13.5 by 14
Stamp issuing authority Department of Posts
Printer Department of Government Printing, Sri Lanka
Connect to the web shop of the issuing stamp authority