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  2. Collectors Universe - Wikipedia

    en.wikipedia.org/wiki/Collectors_Universe

    Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles. Its authentication services focus on coins, trading cards, sports memorabilia, and autographs.

  3. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    Numismatic Guaranty Company (NGC) is a private company that certifies coins, tokens, and medals worldwide. It offers authentication, grading, attribution, and encapsulation services, and has certified over 60 million coins since 1987.

  4. Professional Coin Grading Service - Wikipedia

    en.wikipedia.org/wiki/Professional_Coin_Grading...

    PCGS is an American coin grading service that offers certification, authentication, and encapsulation for U.S. and foreign coins. It also provides population reports, price guide, coin facts, and set registry programs for collectors.

  5. If You Find a Rare ‘Doubled Die’ Penny, It Could Be Worth $1. ...

    www.aol.com/finance/rare-doubled-die-penny-could...

    According to the Numismatic Guaranty Company (NGC), the world’s largest rare coin authentication and grading service, a coin-making die is classified as “a cylindrical shaft of steel that ...

  6. 10 of the Most Valuable Nickels - AOL

    www.aol.com/10-most-valuable-nickels-120158412.html

    Using the data provided by NGC and the Professional Coin Grading Service (PCGS), GOBankingRates compiled a list of the most valuable, rare U.S. nickels sold at public auctions as of Nov. 2, 2023.

  7. Coin grading - Wikipedia

    en.wikipedia.org/wiki/Coin_grading

    Learn about the process and criteria of determining the grade or condition of a coin, one of the key factors in its collectible value. Compare different grading systems used in the U.S. and Europe, and see how certification services professionally grade coins for fees.

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