Trading Card Glossary › Grading & Authentication
SGC
Also known as: Sportscard Guaranty Corporation
Sportscard Guaranty Corporation (SGC) is one of the "Big 4" grading companies, well respected for its consistent and reliable grading standards. SGC is particularly known for its grading of vintage sports cards and has experienced a surge in popularity in recent years. SGC uses a 1–10 numeric scale (with half-points) and is recognized for its distinctive black-bordered plastic slabs.
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