Sportscard guaranty corp
Grading CardsCard Grading: Inside the Process with PSA, SGC
Third-party grading has grown by leaps and bounds in the card hobby, and prices has skyrocketed as a result for those in high grades. PSA and SGC are the heavyweights in third-party card grading; Orlando and Hileman share details on how the process has changed.
Greg Bates