Professional Sports Authenticator
Offers online price guides and population report, sports card certification, set registry, and message boards.
www.psacard.com
Sportscard Guarantee
Provider of sports card grading and authentication services.
www.sgccard.com
Beckett Grading Services
Site features population reports, graded card lookup, and counterfeits archive.
www.beckett.com/grading
GMA Grading
Grading and authentication for baseball, football, and other sports cards.
www.gmagrading.com
Pro Sports Grading
Identification and grading of standard, special issue, and autographed cards.
www.prograding.net
Professional Grading Service
Provides auction services and web-based publication of graded cards.
www.prograding.com
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