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In page Professional Coin Grading Service:

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PCGS certifies most U.S. and foreign coins, which consists of grading, authenticating, attributing, and encapsulating them in clear, airtight plastic holders. PCGS services include special label programs, "First Strike" designations, True View (high quality photography), conservation, and tiered certification (priced according to values and turnaround times). Coins that are improperly cleaned, doctored, damaged, or otherwise impaired will not be numerically graded by PCGS, but upon request will still be authenticated and given verbal "details" grades.[1][2]