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 OM018.04

  1. Om018.04-80
    Wns Number
    OM018.04
    Country / Post
    Oman
    Date of Issue
    June 05, 2004
    Subject
    WWF - Arabian Leopard
  2. Om019.04-80
    Wns Number
    OM019.04
    Country / Post
    Oman
    Date of Issue
    June 05, 2004
    Subject
    WWF - Arabian Leopard
  3. Om020.04-80
    Wns Number
    OM020.04
    Country / Post
    Oman
    Date of Issue
    June 05, 2004
    Subject
    WWF - Arabian Leopard
  4. Om021.04-80
    Wns Number
    OM021.04
    Country / Post
    Oman
    Date of Issue
    June 05, 2004
    Subject
    WWF - Arabian Leopard