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  2. Philatelic fakes and forgeries - Wikipedia

    en.wikipedia.org/wiki/Philatelic_fakes_and_forgeries

    If a stamp has a forged cancellation, it necessarily is a philatelic forgery since it was obviously made for sale to collectors, not to be used to send a letter. [10] If the cancellation is genuine, it is likely, but not necessarily, a postal forgery, since sometimes forgers have used genuine cancellation devices to "cancel" forged stamps. [ 11 ]

  3. Stamp numbering system - Wikipedia

    en.wikipedia.org/wiki/Stamp_numbering_system

    A related issue is a small number of extremely rare stamps that may or may not be old forgeries; the assignment or removal of a number is a key step in the consensus as to their authenticity. Philatelists typically identify more types of stamps than do the governments issuing them.

  4. Philatelic expertisation - Wikipedia

    en.wikipedia.org/wiki/Philatelic_expertisation

    Philatelic expertisation is the process whereby an authority is asked to give an opinion whether a philatelic item is genuine and whether it has been repaired or altered in any way. Forging and faking, regumming and reperforating of stamps is common in the philatelic marketplace, and increasingly buyers demand an expert certificate before ...

  5. Forgery as covert operation - Wikipedia

    en.wikipedia.org/wiki/Forgery_as_covert_operation

    Philatelic forgery is the creation of false postage stamps that are designed to look genuine. Because of their wide publication, stamps are a powerful tool of propaganda. Forged stamps were used by both the Allies and Axis Powers during World War II. Large philatelic campaigns were also conducted throughout the Cold War.

  6. Coded postal obliterators - Wikipedia

    en.wikipedia.org/wiki/Coded_postal_obliterators

    The Hellenic Post Office introduced numerically coded postal obliterations in October 1861, with the introduction of the first postage stamps. They were of rhombic (diamond) shape with the number of the post office at the center. In philatelic publications they are classified as Type I Classic Postmarks. A total of 150 different numbers can be ...

  7. Cancelled-to-order - Wikipedia

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

    Cancelled-to-order "stamps" of Fujairah, one of the United Arab Emirates, showing unobtrusive placement of cancellations in stamp corners 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 ...

  8. List of stamp forgers - Wikipedia

    en.wikipedia.org/wiki/List_of_stamp_forgers

    Today there is an extensive literature on the forgers and their work, and examples from the most accomplished forgers sometimes sell for more than the original stamp. Notorious and famous stamp forgers include: The Spiro Brothers [1] Rainer Blüm; Pêra de Satanás; Clive Feigenbaum; ex-chairman of Stanley Gibbons; Sigmund Friedl; Georges Fouré

  9. Plate number - Wikipedia

    en.wikipedia.org/wiki/Plate_number

    The plate number is on one stamp out of the number of stamps printed by a single revolution of rotary printing press used to print the stamps. In the example above, which is a closeup of a strip of 1996 "flag over porch" self-adhesive stamps, we can see a plate number comprising five digits, one for each color layer.