Trading Card Glossary › Grading & Authentication
PSA
Also known as: Professional Sports Authenticator
Professional Sports Authenticator (PSA) , founded in 1991 and based in California, is the world's largest and most recognized third-party sports card grading and authentication company. PSA grades cards on a 1–10 numeric scale, encases them in a tamper-evident plastic holder called a "slab," and assigns a unique PSA certification number. Cards graded by PSA typically command a significant premium on the secondary market compared to ungraded (raw) cards. PSA also authenticates autographs and other collectibles.
Related terms