Can you explain the significance of grading services like CGC (Certified Guaranty Company) in the comic book industry, and how their grading criteria differ from other collectible grading services?

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4 days, 5 hours ago in Comic Books & Memorabilia

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Can you explain the significance of grading services like CGC (Certified Guaranty Company) in the comic book industry, and how their grading criteria differ from other collectible grading services?