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.

UN135.11

Country / Post United Nations – New York
Date of Issue 7 September 2011
Primary theme Fauna (Birds of Prey)
Subject 2011 Endangered Species - Californian Condor
Width 39.2 mm
Height 28.6 mm
Denomination 0.44 USD
Number in set 4 (show set)
Layout/Format sheet of 16 of 4 designs
Perforations 12.5 by 12.75
Stamp issuing authority United Nations Postal Administration
Printer Lowe Martin Group Canada
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