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.

LK005.06

Country / Post Sri Lanka
Date of Issue 6 January 2006
Primary theme Engineering
Subject 100th Anniversary of The Institution of Engineers
Width 25.0 mm
Height 30.0 mm
Denomination 5.00 LKR
Number in set 1
Layout/Format sheet of 100
Perforations 13.5 by 12
Stamp issuing authority Department of Posts
Printer Department of Government Printing, Sri Lanka