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  1. Official Trading Card Grading Service - PSA

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  3. Card Grading - Sports, Gaming, Non-Sports Cards - Beckett

  4. SGC Grading

  5. PSA Collectibles Authentication and Grading Service

  6. Card Grading Service - GameStop

  7. The Best Card Grading Companies Of 2024 - Sports Card Specialist

  8. DCI Grading: Best Card Grading Company | RCR, Slabbing & More

  9. Card Grading Standards - Beckett

  10. Where Should You Grade Your Sports Cards? Comparing PSA