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  2. Professional Sports Authenticator - Wikipedia

    en.wikipedia.org/wiki/Professional_Sports...

    PSA was launched in July 1991 by David Hall, owner of the coin grading company Professional Coin Grading Service (PCGS), to serve collectors as a third-party card grader. [1] At the outset, the business faced difficulties owing to a limited demand from collectors who sought card grading services. [2]

  3. 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.

  4. 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.

  5. PSA Reopens All Card Authentication and Grading Services - AOL

    www.aol.com/news/psa-reopens-card-authentication...

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  6. 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.

  7. Certified Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Certified_Guaranty_Company

    Certified Guaranty Company, also known as CGC, is a Sarasota, Florida comic book grading service. CGC is an independent member of the Certified Collectibles Group of companies. It is the first independent and impartial third party grading service for comic books.

  8. Trail difficulty rating system - Wikipedia

    en.wikipedia.org/wiki/Trail_difficulty_rating_system

    A trailhead signage that shows the grade of a walking path at a park in Sydney, Australia.. A trail difficulty rating system, also known as walking track grading system, walk gradings or trail grades, is a classification system for trails or walking paths based on their relative technical and physical difficulty. [1]

  9. PSA International - Wikipedia

    en.wikipedia.org/wiki/PSA_International

    PSA International Pte Ltd, formerly the Port of Singapore Authority, is a global port operator and supply chain company.One of the largest port operators in the world, PSA's portfolio comprises over 70 deepsea, rail, and inland terminals across more than 180 locations in 45 countries, including flagship operations in Singapore and Belgium, and encompasses supply chain solutions, marine, and ...