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  2. Errors, freaks, and oddities - Wikipedia

    en.wikipedia.org/wiki/Errors,_freaks,_and_oddities

    Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended. Perforation error: Perforations are missing on one or several sides or put in the wrong place (e.g. diagonally). As perforations may be removed by cutting them off ...

  3. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    Like other coins, the value of errors is based in part on rarity and condition. In general, lower denomination errors are less expensive than higher denomination errors simply because more such coins are minted resulting in available errors. Due to improvements in production and inspection, modern errors are more rare and this impacts value. [3]

  4. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The 3-legged Buffalo nickel was the direct result of die polishing and the removal of a leg. The 1970 Lincoln cent with the raised 7 is also the result of die polishing. Jefferson nickel with a die crack. Before 1990, all US coin dies were subject to mint mark errors resulting from the preparation of the dies. The mint mark was hammered into ...

  5. Pan-American invert - Wikipedia

    en.wikipedia.org/wiki/Pan-American_invert

    The first day of issue for the stamps was May 1, 1901. [1]: 60–61 The two color printing left the possibility of errors. Three of the denominations, 1 cent, 2 cents and 4 cents, were printed in sheets on which the center vignette was inverted relative to the frame. The inverts carry the Scott catalog numbers 294a, 295a, and 296a respectively.

  6. Postage stamps and postal history of the United States

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

    Postal service in the United States began with the delivery of stampless letters whose cost was borne by the receiving person, later encompassed pre-paid letters carried by private mail carriers and provisional post offices, and culminated in a system of universal prepayment that required all letters to bear nationally issued adhesive postage stamps.

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