Quote:
Originally Posted by barrysloate
Coins are in the same boat as cards. If it's been determined that a coin has been cleaned, even ever so slightly, it's not eligible for a numeric grade. It gets the equivalent of an AUTH. Certain hobbies simply do not accept cleaning or altering of any kind. And yes, sometimes the coin graders miss it, and sometimes there is a difference of opinion- one grader says cleaned, the other says original.
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You are allowed to clean dirt & grime off of coins and still have them graded...