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Be sure to check the Cert Verification page before buying. That's to ensure you don't have a fake slag.
Many (if not most) counterfeit slabs will now have a certification number that will come back to the correct issue in the stated grade. What may still tip you off to the forgery is if the lookup shows that the coin is supposed to be part of a registry set or has been recently sold in an auction.
Colligo ergo sum