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.
From an original mintage of 4,000 business strikes, an estimated 150 to 220 1866 three dollar gold pieces are thought to exist, of which perhaps 25 to 40 are in Mint State (David Bowers and Douglas Winter, 2005).
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