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.

HK009.10

Country / Post Hong Kong (PRC)
Date of Issue 27 April 2010
Primary theme Exhibitions, Fairs & Carnivals (Exhibitions)
Subject Hong Kong's Participation in Expo 2010 Shanghai, China
Width 45.0 mm
Height 28.0 mm
Denomination 2.40 HKD
Number in set 4 (show set)
Layout/Format sheet of 25
Perforations 13,25 by 13.25
Stamp issuing authority Hongkong Post
Printer Cartor Security Printing, France
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