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2. 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.

3. Third-party grading - Wikipedia

   en.wikipedia.org/wiki/Third-party_grading

   Third-party grading (TPG) refers to coin grading & banknote grading authentication, attribution, and encapsulation by independent certification services.. These services will, for a tiered fee depending on the value of the coin, "slab" a coin and assign a grade of 1–70 on the Sheldon grading system, with 1 being the lowest grade, with only faint details visible to 70, a practically perfect ...

4. Professional Coin Grading Service - Wikipedia

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

   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 company Collectors Universe. PCGS has graded over 42.5 million coins, medals, and tokens valued at over $36 billion. [6]

5. Collectors Universe - Wikipedia

   en.wikipedia.org/wiki/Collectors_Universe

   The company engages in business-to-business market for certified coins under Certified Coin Exchange, and a business-to-consumer under Collectors Corner. PCGS Coin Authentication and Grading Services focuses on coins market and have authenticated and graded over 42.5 million coins, medals, and tokens with an estimated market value of over $36 ...

6. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted. Several grading systems have been ...

7. Rare 1776 continental dollar coin found inside toffee tin to ...

   www.aol.com/news/rare-1776-continental-dollar...

   The silver versions of the coins are extremely rare and only two are known to exist, according to the Professional Coin Grading Service, a rare coin grading company. About 20 pewter continental ...