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 HU023.04

  1. Hu023.04-80
    Wns Number
    HU023.04
    Country / Post
    Hungary
    Date of Issue
    March 18, 2004
    Subject
    World Heritages in Hungary II - Pannonhalma
  2. Hu024.04-80
    Wns Number
    HU024.04
    Country / Post
    Hungary
    Date of Issue
    March 18, 2004
    Subject
    World Heritages in Hungary II - Hortobágy