The following companies offer coin grading and authentication. Significantly, these five services combined have graded and authenticated several million coins over the years.
PCGS, NGC, and ANACS all publish periodic population reports. These reports detail the denominations, dates, mintmarks, and grades of the millions of coins that they have graded. Population reports are useful tools for ascertaining the relative rarity of different issues. Copies of the population reports published by the respective firms can be acquired by contacting the publishers mentioned at the beginning of this paragraph.
ANACS. http://www.anacs.com/
ICG (Independent Coin Grading Comany). http://www.icgcoin.com/
NGC (Numismatic Guaranty Corporation). http://www.ngccoin.com/
PCGS (Professional Coin Grading Sevice). http://www.pcgs.com/
PCI Coin Grading Service. http://www.pcicoins.com/index.htm
Sovereign Entities Grading Service Inc. http://www.segscoins.com/
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