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Showing 4 results for the tag: grading.
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Third-Party Sports Card Grading and Its Effect on Value (10/6/08)
The grading of sports cards has become a widely accepted method for verifying a card’s condition and authenticity. Grading was first introduced to the hobby in 1991 by Professional Sports Authenticator (PSA) of Newport Beach, Calif. PSA is a company spun off from Professional Coin Grading Service.
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