Professional Sports Authenticator
Founded back in 1991, Professional Sports Authenticator is the world’s largest card grading company.
PSA has graded well over 40 million cards with a collective value of over a billion dollars. This is no surprise considering they have offices all across the globe. PSA is a part of Collectors Universe, which is a leading provider of authentication and grading services for collectibles. PSA’s team of experts is highly trained in identifying counterfeit items and assessing the condition of cards.