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 PY010.17

  1. Py010.17-80
    Wns Number
    PY010.17
    Country / Post
    Paraguay
    Date of Issue
    May 12, 2017
    Subject
    Working Mothers and Workers
  2. Py011.17-80
    Wns Number
    PY011.17
    Country / Post
    Paraguay
    Date of Issue
    May 12, 2017
    Subject
    Working Mothers and Workers