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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. History of United States postage rates - Wikipedia

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

    The United States Postal Service proposed a price increase for Forever stamps in July 2024, raising the cost from 68 to 73 cents. This follows an increase in January 2024 and marks the sixth increase since January 2021. Despite these ongoing price hikes, the United States maintains relatively inexpensive postage compared to other developed ...

  4. Postage stamps and postal history of the United States

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

    The F stamp in 1991 was accompanied by an undenominated "make-up" stamp with no pictorial design beyond a frame, which enclosed the words "This U. S. stamp, along with 25¢ of additional U. S. postage, is equivalent to the 'F' stamp rate."

  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. List of United States airmail stamps - Wikipedia

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

    Date Issued Type Subject Plate No. Image No. Issued June 25, 1941: 6¢ Carmine [P 2] [PERF 2] (200 Subject Electric Eye Plates) Size: 1.44 x 0.84 inch: The Twin-Motored Transport Plane

  7. 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]