A copy of DC’s Action Comics #1, featuring Superman’s first appearance, was just sold at auction for a record-breaking $6 million. The 1938 comic book is graded at a “Very Fine+” 8.5 and is in ...

Third-party comic grading, dominated in the industry by Certified Guaranty Company (CGC), uses a multi-step process designed to ensure consistency, accuracy, and integrity while safeguarding valuable ...