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.

LK008.07

Country / Post Sri Lanka
Date of Issue 1 April 2007
Primary theme Post & Philately (Stamps on stamps)
Subject 150th Anniversary of the First Postage Stamp of Sri Lanka
Width 40.0 mm
Height 30.0 mm
Denomination 20.00 LKR
Number in set 4 (show set)
Layout/Format miniature sheet of 4 of 4 designs
Perforations 13 by 13
Stamp issuing authority Department of Posts
Printer Department of Government Printing, Sri Lanka