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  2. Postage stamps and postal history of the Confederate States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    During the first seven weeks of the Civil War, the U.S. Post Office still delivered mail from the seceded states. Mail that was postmarked after the date of a state's admission into the Confederacy through May 31, 1861, and bearing U.S. (Union) postage is deemed to represent 'Confederate State Usage of U.S. Stamps'. i.e., Confederate covers franked with Union stamps. [4]

  3. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Benjamin Franklin — George Washington The First U.S. Postage Stamps, issued 1847. The first stamp issues were authorized by an act of Congress and approved on March 3, 1847.[ 20] The earliest known use of the Franklin 5¢ is July 7, 1847, while the earliest known use of the Washington 10¢ is July 2, 1847.

  4. Washington–Franklin Issues - Wikipedia

    en.wikipedia.org/wiki/Washington–Franklin_Issues

    The Washington–Franklin Issues are a series of definitive U.S. Postage stamps depicting George Washington and Benjamin Franklin, issued by the U.S. Post Office between 1908 and 1922. The distinctive feature of this issue is that it employs only two engraved heads set in ovals—Washington and Franklin in full profile—and replicates one or ...

  5. List of Machin stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_Machin_stamps

    All barcoded stamps are self-adhesive. Existing definitive stamps issued from 15 February 1971 to 31 January 2022 remain valid until 31 January 2023: since 31 March 2022, they can be indefinitely exchanged for the barcoded series. [18] The 2022 issue was the last release in the Machin series prior to the death of Elizabeth II.

  6. Machin series - Wikipedia

    en.wikipedia.org/wiki/Machin_series

    The Machin series / ˈmeɪtʃɪn / of postage stamps was the main definitive stamp series in the United Kingdom for most of the reign of Elizabeth II, from 1967 until her death in 2022. Introduced on 5 June 1967, it was the second series of her reign, replacing the Wilding series. The last issue was on 4 April 2022, four months before the Queen ...

  7. Bureau of Engraving and Printing - Wikipedia

    en.wikipedia.org/wiki/Bureau_of_Engraving_and...

    The Bureau of Engraving and Printing officially took over production of postage stamps for the United States government in July 1894. The first of the works printed by the BEP was placed on sale on July 18, 1894, and by the end of the first year of stamp production, the BEP had printed and delivered more than 2.1 billion stamps.

  8. Self-adhesive stamp - Wikipedia

    en.wikipedia.org/wiki/Self-adhesive_stamp

    Self-adhesive stamp. A self-adhesive stamp is a postage stamp with a pressure-sensitive adhesive that does not require moistening in order to adhere to paper. They are usually issued on a removable backing paper. Stamp collectors have criticized the format, because the rubber-based adhesive used tends to yellow the stamps progressively.

  9. Microcontact printing - Wikipedia

    en.wikipedia.org/wiki/Microcontact_printing

    Microcontact printing (or μCP) is a form of soft lithography that uses the relief patterns on a master polydimethylsiloxane (PDMS) stamp or Urethane rubber micro stamp [1] to form patterns of self-assembled monolayers (SAMs) of ink on the surface of a substrate through conformal contact as in the case of nanotransfer printing (nTP). [2]

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