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There are quite a few Coin Grading companies to choose from. In my opinion there are three (3) Tiers in which I have placed these companies, based on their popularity and reliability among most collectors and experts.
I. FIRST TIER
a. Professional Coin Grading Service (PCGS) - 1985 - founded by small group of the nation's leading coin experts for rare coins industry.
b. Numismatic Guarantee Corp. (NGC) - 1987 - official grading service of ANA ( American Numismatic Assoc.) and PNG (Professional Numismatic Guild).
II. SECOND TIER
a. American Numismatic Association Certification Service (ANACS) - founded in 1972 by ANA; sold to Amos Press in 1990; acquired by Driving Force LLC in 2007 - Service I use for Coin Errors.
b. Independent Coin Graders (ICG) - 1998 - truly independent third-party grading service.
III. THIRD TIER - Every other company that calls itself a Grading Service
My two (2) basic rules are:
1. ALWAYS use/buy from First & Second Tier services.
2. NEVER use/buy from Third Tier services.
"Why?" you may ask. The short and simple response is over-graded coins. You see many if not most of the Third Tier Services feature coins graded by the seller.
My other warning is about counterfeit slabs (professionally graded and encapsulated coins) that claim to be from one of the Top Two Tier services. To avoid that trap, only buy from reputable sellers.
Educate yourself and learn BEFORE you buy. Trust me; you'll be glad you did.
© 2016
Here's an abbreviated course on Coin Grading. It's a good start for those wishing to understand it, as well as a nice review for those who do.
First a disclaimer - "Gradeflation" is all around us. Inflating grades to a higher than deserved level is nothing new; it's just becoming more prevalent. An assigned "Grade" is just one person's opinion. My advice - Buy what appeals to you at the right price for you.
GLOSSARY
Contact Marks - caused by contact with other coinsWithout further delay, let's explore the Sheldon Scale of grading coins, created by American numismatist Dr. William H. Sheldon in 1949. This scale has become widely known and firmly accepted as the standard for coin grading in the US. The scale runs from 1 to 70.
- POOR (P) 1 - badly damaged with very smooth surface due to wearTwo (2) useful reference books are "Grading Coins by Photographs" ($15-20) and "The American Numismatic Association Grading Standards for U.S. Coins" ($16-20). There also numerous helpful online resources.
Now you know the basics of Coin Grading. Time and experience will refine your abilities.© 2016