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 SI010.19

  1. Si010.19-80
    Wns Number
    SI010.19
    Country / Post
    Slovenia
    Date of Issue
    March 22, 2019
    Subject
    Joint issue Slovenia - Slovakia - Sundial
  2. Si011.19-80
    Wns Number
    SI011.19
    Country / Post
    Slovenia
    Date of Issue
    March 22, 2019
    Subject
    Joint issue Slovenia - Slovakia - Astronomical Clock