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What does the CAC sticker mean?

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Certified Acceptance Corporation (CAC) is a coin grade verification service. It was founded in 2007 to examine and evaluate coins that have been previously certified by Numismatic Guaranty Corporation (NGC) or Professional Coin Grading Service (PCGS). CAC examines a coin to determine whether, in its opinion, the coin is correctly, over-, or under-graded. Coins that are correctly graded will have a green tamper-evident holographic sticker affixed to their holders. In the unusual event that a coin is found to be under-graded, a gold sticker is affixed instead. Coins that are thought to "just make the grade" or appear over-graded receive no sticker at all.

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