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2. Professional Coin Grading Service - Wikipedia

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

   Professional Coin Grading Service (PCGS) is an American third-party coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's former president David Hall, was to standardize grading. [4][5] The firm has divisions in Europe and Asia, and is owned by parent ...

3. Standard Catalog of World Coins - Wikipedia

   en.wikipedia.org/.../Standard_Catalog_of_World_Coins

   Collecting World Coins: Standard Catalog of Circulating Coinage: 1901–present, 15th Edition, publication date 2015, Krause Publications, ISBN 978-1-4402-4460-5 Digital copy available separately. Standard Catalog of German Coins: 1501–present, 3rd Edition, publication date 2011, Krause Publications, ISBN 978-1-4402-1402-8

4. List of coin catalogs - Wikipedia

   en.wikipedia.org/wiki/List_of_coin_catalogs

   A coin catalog (or coin catalogue) is a listing of coin types. Information may include pictures of the obverse and reverse (front and back), date and place of minting, distribution type, translation of inscriptions, description of images, theme, metal type, mintage, edge description, orientation of the coin, weight, diameter, thickness, design credentials, shape and prices for various grades.

5. Numismatic Guaranty Company - Wikipedia

   en.wikipedia.org/wiki/Numismatic_Guaranty_Company

   Numismatic Guaranty Company (NGC) is an international third-party coin grading and certification service based in Sarasota, Florida. It has certified more than 60 million coins. NGC certification consists of authentication, grading, attribution, and encapsulation in clear plastic holders. NGC is a subsidiary of Certified Collectibles Group (CCG ...

6. List of Chinese cash coins by inscription - Wikipedia

   en.wikipedia.org/wiki/List_of_Chinese_cash_coins...

   This cash coins has rather broad rims. 大觀通寶 (Daguan Tongbao) 中 (Zhong) The "中" is written in seal script and is above the square center hole on the reverse. 大觀通寶 (Daguan Tongbao) 半錢 (Ban Qian) The reverse inscription indicates that this cash coin had a nominal value of half a qián of silver.

7. List of most expensive coins - Wikipedia

   en.wikipedia.org/wiki/List_of_most_expensive_coins

   List of most expensive coins Price Year Type Grade Issuing country Provenance Firm Date of sale $18,900,000 1933 1933 double eagle: MS-65 CAC United States: King Farouk of Egypt: Sotheby's [1] June 8, 2021 $12,000,000 1794 Flowing Hair dollar: SP-66 CAC United States Neil, Carter Private sale [2] January 24, 2013 $9,360,000 1787 Brasher ...