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 CZ013.19

  1. Cz013.19-80
    Wns Number
    CZ013.19
    Country / Post
    Czech Republic
    Date of Issue
    May 22, 2019
    Subject
    50 Years of the Čtyřlístek Comic
  2. Cz014.19-80
    Wns Number
    CZ014.19
    Country / Post
    Czech Republic
    Date of Issue
    May 22, 2019
    Subject
    50 Years of the Čtyřlístek Comic