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 Oman in 2013

The 2013 issuing programme is not available.
  1. Om021.13-80
    Wns Number
    OM021.13
    Country / Post
    Oman
    Date of Issue
    November 18, 2013
    Subject
    43rd National Day
  2. Om022.13-80
    Wns Number
    OM022.13
    Country / Post
    Oman
    Date of Issue
    December 11, 2013
    Subject
    Sultan's Armed Forces Museum
  3. Om023.13-80
    Wns Number
    OM023.13
    Country / Post
    Oman
    Date of Issue
    December 11, 2013
    Subject
    Sultan's Armed Forces Museum

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