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.
Along with the 1839, the 1840-O (and the unique 1842), the 1840 Reverse of 1839 is the only issue in the entire Seated half dollar series to display small letters on the reverse. The latter issue is more common than both the 1839 and 1840-O in all grades.
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