Genuine 91 - Questionable Toning
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N Grade coins are unique to the PCGS grading system and are so designated with a coin is not graded. Beginning in 2013 PCGS added a general indication of how the coin would have graded had it not been disqualified.
A coin given a designation of N-91 has questionable or artificial toning. Toning is a natural chemical process that occurs as a coin reacts to its environment. Collectors consider colorful, natural toning to be desirable and they often pay premiums for attractively toned coins.
However, toning can be added, enhanced or accelerated by artificial means, creating the appearance of natural toning. In most cases, these treatments result in unnatural colors which the experts at PCGS will reject.
PCGS Graded Coins