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 PY002.18

  1. Py002.18-80
    Wns Number
    PY002.18
    Country / Post
    Paraguay
    Date of Issue
    March 26, 2018
    Subject
    50 Years of the Italo-Latin American Institute
  2. Py003.18-80
    Wns Number
    PY003.18
    Country / Post
    Paraguay
    Date of Issue
    March 26, 2018
    Subject
    50 Years of the Italo-Latin American Institute