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.

All registered stamps issued by Mexico with theme "Birds - General"

  1. Mx071.10-80
    Wns Number
    MX071.10
    Country / Post
    Mexico
    Date of Issue
    December 15, 2010
    Subject
    Discovery of Mexico - Great Blue Heron
  2. Mx032.07-80
    Wns Number
    MX032.07
    Country / Post
    Mexico
    Date of Issue
    September 20, 2007
    Subject
    Universal Forum of Cultures, Monterey 2007