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 1840, the obverse of the half eagle was modified again. Liberty's neck was redesigned with a less obvious curve than seen on the 1839 issues. Most importantly, the mintmark was moved to the reverse where it would stay on all regular issue United States half eagles until 1933. The 1840-D is tied for the eighth rarest Dahlonega half eagle in terms of its overall rarity. An estimated 120-140 pieces are known with 22-27 in AU and another five to seven in Uncirculated.
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