All of the coins we sell are guaranteed authentic, unless otherwise clearly identified as a copy. Many of the coins in our inventory have been certified as authentic by NGC (Numismatic Guaranty Company) and PCGS (Professional Coin Grading Service). In addition these companies assign a quality grade to the coin. The coins are encapsulated in a plastic holder to preserve and protect the coin from damage. The NGC or PCGS holder enhances the value of the coin and confidence that it is authentic as well as enhancing the resale value.