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.

LK006.11

Country / Post Sri Lanka
Date of Issue 2 February 2011
Primary theme Transportation (Rail) (Steam engines)
Subject 25th Anniversary of Viceroy Special Steam Train
Width 41.0 mm
Height 30.0 mm
Denomination 5.00 LKR
Number in set 5 (show set)
Layout/Format sheet of 20 of 4 designs
Perforations 14 by 13.5
Stamp issuing authority Department of Posts
Printer Department of Government Printing, Sri Lanka