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.

SL001.04

Country / Post Sierra Leone
Date of Issue 15 January 2004
Primary theme Holy Days & Celebrations (Chinese New Year)
Subject Year of the Monkey
Width 38.5 mm
Height 30.0 mm
Denomination 1200 SLL
Number in set 5 (show set)
Layout/Format miniature sheet of 4 of 4 designs
Perforations 14 by 14
Stamp issuing authority Sierra Leone Postal Services Limited
Printer BDT International Security Printing Ltd