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Professional Coin Grading Service Professional Coin Grading Service- Includes prices and descriptions of grading and authentication services. Robert Matthews Coin Authentication Robert Matthews Coin Authentication- Specialises in the scientific examination and authentication of British milled coins. PCI PCI- Accepts direct submittals from the general public, collectors and dealers. Sovereign Entities Grading Service, Inc. Sovereign Entities Grading Service, Inc.- Grading and encapsulating service for U.S. coins, errors, and varieties. Numismatic Guaranty Corporation of America Numismatic Guaranty Corporation of America- Submit most US and world coins for grading through an authorized member/dealer. Independent Coin Grading Company Independent Coin Grading Company- Offering blind submission through a CPA firm to eliminate submission bias. Ancient Coin Certification Service Ancient Coin Certification Service- David R. Sear provides an authoritative aid to collectors and dealers who are seeking both a valid attribution of their coins and confirmation … ANACS ANACS- A service that renders an opinion on a coin's authenticity and grade.