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  2. Trodat - Wikipedia

    en.wikipedia.org/wiki/Trodat

    According to its own data, Trodat is the largest manufacturer of stamps in the world, in terms of base sales. It specialises in self-inking stamps with a built-in stamp pad. The Trodat Printy stamp, which was introduced to the market in 1976, has sold over 300 million, according to the manufacturer's data.

  3. 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]

  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.

  5. Postage stamps and postal history of the United States

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

    The 1¢ stamp achieved notoriety, at least among philatelists, because production problems (the stamp design was too tall for the space provided) led to a welter of plate modifications done in piecemeal fashion, and there are no fewer than seven major varieties, ranging in price from $100 to $200,000 (the latter for the only stamp of the 200 ...

  6. 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.

  7. Stamp condition - Wikipedia

    en.wikipedia.org/wiki/Stamp_condition

    Stamps sell at a considerable premium if they are in this condition. Lightly hinged (LH) is a mint stamp which was hinged but only slightly disturbed. Heavily hinged (HH) is a mint stamp which was hinged and damaged in the process. Hinge remaining (HR) is a mint stamp which has part of a stamp hinge on the back.

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