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 PY023.04

  1. Py022.04-80
    Wns Number
    PY022.04
    Country / Post
    Paraguay
    Date of Issue
    October 22, 2004
    Subject
    Agriculture - Maize
  2. Py023.04-80
    Wns Number
    PY023.04
    Country / Post
    Paraguay
    Date of Issue
    October 22, 2004
    Subject
    Agriculture - Cotton
  3. Py024.04-80
    Wns Number
    PY024.04
    Country / Post
    Paraguay
    Date of Issue
    October 22, 2004
    Subject
    Agriculture - Soya