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.

RS031.11

Country / Post Serbia
Date of Issue 3 June 2011
Primary theme Science & Technology (Information Technology)
Subject Digital Serbia
Width 30.0 mm
Height 37.5 mm
Denomination 22 CSD
Number in set 2 (show set)
Layout/Format sheet of 25
Perforations 13.25 by 13.25
Stamp issuing authority Public Enterprise of PTT Srbija
Printer Zin Belgrade