The NGC Universal ID is a four digit alphanumeric that groups coins based on a unique combination of date, mintmark, denomination and striking process (MS, PF, or SP). These IDs are a simple organization of all coins prior to variety attribution and grading.
In the finer Mint State grades, the 1930 and 1931 are the two rarest P-mint deliveries from the final two decades in the Mercury dime series. The former issue was produced to the extant of 6.7 million pieces, and most survivors are either circulated, noticeably abraded, or poorly defined.
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