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2. List of most expensive sports cards - Wikipedia

   en.wikipedia.org/wiki/List_of_most_expensive...

   Cards are evaluated by third-party services, most often Professional Sports Authenticator (PSA), Beckett Grading Services (BGS) and Sportscard Guaranty (SGC), and given a grade on a ten-point scale based on condition. [5] The images below do not necessarily represent the individual specimen sold but are representative of the given cards.

3. 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] Initially, many sports card dealers were ...

4. T206 Honus Wagner - Wikipedia

   en.wikipedia.org/wiki/T206_Honus_Wagner

   The Professional Sports Authenticator (PSA) company graded this card a PSA 8 Near Mint-Mint (NM-MT) on their 10-point scale, [31] [32] the highest grade given to a T206 Honus Wagner card. Bill Hughes [33] was the official grader of the card, working for PSA at the time. Hughes admitted to knowing that the card had been altered when he graded it ...

5. Baseball card - Wikipedia

   en.wikipedia.org/wiki/Baseball_card

   One of the most famous price guides is the Beckett price guide series. The Beckett price guide is a graded card price guide, which means it is graded by a 1–10 scale, one being the lowest possible score and ten the highest. In addition, Professional Sports Authenticator (PSA) grades cards 1–10, and can authenticate autographs as well.

6. Beckett Media - Wikipedia

   en.wikipedia.org/wiki/Beckett_Media

   Beckett Media, LLC. Beckett Media is a firm dedicated to covering the sports card, comic book grading, collectibles, and sports memorabilia sectors. Established in 1984 by statistician Dr. James Beckett, it was originally known as Beckett Publications.

7. Collectors Universe - Wikipedia

   en.wikipedia.org/wiki/Collectors_Universe

   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.