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.


Country / Post Nigeria
Date of Issue 29 September 2011
Primary theme Economy & Industry
Subject Federal Inland Revenue Service (FIRS) - For national development
Width 25.0 mm
Height 40.0 mm
Denomination 20 NGN
Number in set 3 (show set)
Layout/Format sheet of 50
Perforations 13 by 13
Stamp issuing authority Nigerian Postal Service
Printer Nigerian Security Printing & Minting Co Ltd