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.

RS006.11

Country / Post Serbia
Date of Issue 14 February 2011
Primary theme Engineering (Civil & Mechanical)
Architecture (Modern)
Subject Definitive - Avala Tower
Width 22.5 mm
Height 25.5 mm
Denomination 44 CSD
Number in set 1
Layout/Format sheet of 100
Perforations 13.25 by 13.25
Stamp issuing authority Public Enterprise of PTT Srbija
Printer Zin Belgrade