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 YT010.09

  1. Yt009.09-80
    Wns Number
    YT009.09
    Country / Post
    Mayotte
    Date of Issue
    June 29, 2009
    Subject
    The Four Brothers
  2. Yt010.09-80
    Wns Number
    YT010.09
    Country / Post
    Mayotte
    Date of Issue
    June 29, 2009
    Subject
    The Four Brothers