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.

RS017.11

Country / Post Serbia
Date of Issue 4 April 2011
Primary theme Fauna (Birds - General)
Environment & Conservation (WWF)
Subject WWF - Protected Species - Phalacrocorax pygmeus
Width 35.0 mm
Height 31.9 mm
Denomination 33 CSD
Number in set 4 (show set)
Layout/Format sheet of 20
Perforations 13.25 by 13.25
Stamp issuing authority Public Enterprise of PTT Srbija
Printer Forum Novi Sad