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.
The 1851-O is, along with the 1849-O, the rarest Stars Obverse Liberty Seated quarter. When available, the 1851-O tends to be found heavily worn and it is very scarce in full Extremely Fine. It is unlikely that there are more than four or five are known in Mint State.
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