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.

Stamps issued with RS001.11

  1. Rs001.11-80
    Wns Number
    RS001.11
    Country / Post
    Serbia
    Date of Issue
    January 31, 2011
    Subject
    Preserve the Polar Regions and Glaciers
  2. Rs002.11-80
    Wns Number
    RS002.11
    Country / Post
    Serbia
    Date of Issue
    January 31, 2011
    Subject
    Preserve the Polar Regions and Glaciers