what is nnc?
NNC Coin Grading. National Numismatic Certification, LLC. Finally a coin grading company whose products and services meet the demands of both buyers and sellers. NNC is an independent third-party coin grading service which does not buy or sell coins, nor does NNC appraise coins in terms of monetary value. National Numismatic Certification, LLC. cannot guarantee the liquidity of any coin graded by NNC. NNC certification of a particular coin cannot provide protection from the risks inherent in any market for such coins, if such a market exists. NNC Coin Grading - National Numismatic Certification, LLC.