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  2. Cancelled-to-order - Wikipedia

    en.wikipedia.org/wiki/Cancelled-to-order

    A Cancelled-to-order plate block of the US newspaper boy stamp of 1952. A cancelled to order (also called and abbreviated CTO) postage stamp, philatelic symbol , [1] is a stamp the issuing postal service has cancelled (marked as used), but has not traveled through the post, [2] but instead gets handed back to a stamp collector or dealer.

  3. Stamp numbering system - Wikipedia

    en.wikipedia.org/wiki/Stamp_numbering_system

    Stamp numbering system. Philatelists ' traditional method of identifying postage stamps uniquely has long been to number each country's stamps consecutively; Norway #1 is the 4-skilling blue stamp issued in 1855, and so forth. However, this seemingly straightforward numbering system runs into immediate difficulties, which have been solved in ...

  4. National Philatelic Collection (United States) - Wikipedia

    en.wikipedia.org/wiki/National_Philatelic...

    The National Philatelic Collection is a collection of nearly six million postage stamps, revenue stamps, and related items, owned by the United States Government and managed by the Smithsonian Institution. It is housed within the National Postal Museum and a portion of the collection is on display in the museum's National Stamp Salon.

  5. Philatelic and Numismatic Office of the Vatican City State

    en.wikipedia.org/wiki/Philatelic_and_Numismatic...

    The Philatelic and Numismatic Office of the Vatican City State ( Italian: Ufficio Filatelico e Numismatico ), managed by Poste Vaticane, is responsible for issuing Vatican postal stamps and Vatican coins. The office was created on 11 February 1929 in the nations founding, and issued the first of the nations postal stamps on 1 August of the same ...

  6. United States Stamp Society - Wikipedia

    en.wikipedia.org/wiki/United_States_Stamp_Society

    United States Stamp Society. The United States Stamp Society (USSS) is the largest philatelic organization dedicated to the research and study of United States postage and revenue stamps. The Society is a non-profit collector-based organization with a world-wide membership of over 1700. The USSS is Affiliate #150 of the American Philatelic ...

  7. WADP Numbering System - Wikipedia

    en.wikipedia.org/wiki/WADP_Numbering_System

    The WADP Numbering System (WNS) is a project referencing postal stamps issued in the world since 1 January 2002. It is monitored by the World Association for the Development of Philately (WADP) and the Universal Postal Union. Its inventory is made possible by the declarations of the postal administrations participating in the project.

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