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  2. List of United States airmail stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Domestic air mail became obsolete in 1975, and international air mail [2] in 1995, when the USPS began transporting First Class mail by air on a routine basis. [3] [4] All post-1977 United States stamp images are copyright of USPS. [5] Scott cataloged stamps received a "C" designation for airmail issues beginning in 1940. Designated for ...

  3. Scott catalogue - Wikipedia

    en.wikipedia.org/wiki/Scott_catalogue

    The first Scott catalogue was a 21-page pamphlet with the title Descriptive Catalogue of American and Foreign Postage Stamps, Issued from 1840 to Date, Splendidly Illustrated with Colored Engravings and Containing the Current Value of each Variety. It was published in September 1868 by John Walter Scott, an early stamp dealer in New York, and ...

  4. List of most expensive philatelic items - Wikipedia

    en.wikipedia.org/wiki/List_of_most_expensive...

    This is a list of the highest known prices paid for philatelic items, including stamps and covers. The current record price for a single stamp is US$ 9,480,000 paid for the British Guiana 1c magenta. [1][2] This list is ordered by consumer price index inflation-adjusted value (in bold) in millions of United States dollars in 2023. [note 1 ...

  5. Universal Postal Union - Wikipedia

    en.wikipedia.org/wiki/Universal_Postal_Union

    Treaty effective October 1874. The Universal Postal Union (UPU, French: Union postale universelle) is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations and facilitates a uniform worldwide postal system. It comprises 192 member states and is headquartered in Bern, Switzerland.

  6. History of United States postage rates - Wikipedia

    en.wikipedia.org/wiki/History_of_United_States...

    Postal rates to 1847. Initial United States postage rates were set by Congress as part of the Postal Service Act signed into law by President George Washington on February 20, 1792. The postal rate varied according to "distance zone", the distance a letter was to be carried from the post office where it entered the mail to its final destination.

  7. Michel catalog - Wikipedia

    en.wikipedia.org/wiki/Michel_catalog

    Michel catalog. The Michel catalog (MICHEL-Briefmarken-Katalog) is the largest and best-known stamp catalog in the German -speaking world. First published in 1910, it has become an important reference work for philately, with information not available in the English-language Scott catalogue.