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  2. 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]

  3. 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.

  4. 12 of the Rarest U.S. Mint Error Coins Worth a Fortune - AOL

    www.aol.com/12-rarest-u-mint-error-140056411.html

    Estimated value: Between $250,000 and $2 million The 1974 Aluminum Lincoln Cent is an elusive and highly valuable coin, notable for its unique composition. In 1974, the U.S. Mint experimented with ...

  5. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The over mint mark is created when a one date and mint mark is punched over another date, part of a date, or mint mark. These coins are generally restricted to the early minting process of coins dating before the turn of the century. The DDO and DDR errors are related to any part of the coin that shows a distinct doubling.

  6. Philatelic fakes and forgeries - Wikipedia

    en.wikipedia.org/wiki/Philatelic_fakes_and_forgeries

    One would imagine that overprints should be easier for a forger to falsify. It is just a simple matter of applying a few letters to a stamp with black ink. Paying attention to detail can reward a philatelic sleuth. The stamps of Bangkok from the 1880s were produced by overprinting each stamp a single letter "B" on stamps of the Straits Settlements.

  7. Die-deterioration doubling - Wikipedia

    en.wikipedia.org/wiki/Die-deterioration_doubling

    In addition, the mint has a practice of polishing the dies and using them longer. When a die begins to show evidence of wear, a mint technician will polish the die and reuse it. However, the die is still rapidly deteriorating, and polishing it cannot avoid the problem of wear.

  8. 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 ...

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