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 SI009.18

  1. Si009.18-80
    Wns Number
    SI009.18
    Country / Post
    Slovenia
    Date of Issue
    March 09, 2018
    Subject
    Easter - Easter egg
  2. Si010.18-80
    Wns Number
    SI010.18
    Country / Post
    Slovenia
    Date of Issue
    March 09, 2018
    Subject
    Easter - Cross
  3. Si011.18-80
    Wns Number
    SI011.18
    Country / Post
    Slovenia
    Date of Issue
    March 09, 2018
    Subject
    Easter - Painted egg from Bela Krajina