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.

IO013.07

Country / Post British Indian Ocean Territories
Date of Issue 23 July 2007
Primary theme Science & Technology (Famous scientists)
Transportation (Ships & Navigation) (Sailing ships)
Subject 125th Anniversary of the Death of Charles Darwin
Width 35.0 mm
Height 35.0 mm
Denomination 0.54 GBP
Number in set 4 (show set)
Layout/Format sheet of 20
Perforations 13.5 by 13.5
Stamp issuing authority British Indian Ocean Territory Administration
Printer BDT International Security Printers