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 MT021.10

  1. Mt018.10-80
    Wns Number
    MT018.10
    Country / Post
    Malta
    Date of Issue
    September 23, 2010
    Subject
    2010 International Year of Biodiversity - Maltese Wall Lizard
  2. Mt019.10-80
    Wns Number
    MT019.10
    Country / Post
    Malta
    Date of Issue
    September 23, 2010
    Subject
    2010 International Year of Biodiversity - Storm Petrel
  3. Mt020.10-80
    Wns Number
    MT020.10
    Country / Post
    Malta
    Date of Issue
    September 23, 2010
    Subject
    2010 International Year of Biodiversity - Maltese Pyramidal Orchid
  4. Mt021.10-80
    Wns Number
    MT021.10
    Country / Post
    Malta
    Date of Issue
    September 23, 2010
    Subject
    2010 International Year of Biodiversity - Fresh-water Crab