1875 Liberty Gold Eagle
Not only does the 1875 Liberty Gold Eagle have the lowest mintage for the series, it also has the lowest mintage for the denomination or any United States gold coin struck for circulation. A mere 100 circulation strikes were produced by the Philadelphia Mint for this year. Needless to say, this is an extremely prized rarity that generates considerable excitement when an example appears at auction.
Every 1875 Gold Eagle that is known to exist is heavily abraded and features some degree of wear, although some moderate proof like fields will show in the recessed areas of the coin. The finest known example, graded NGC AU 55, realized a price of $74,750 at auction in 2004. It has been estimated that perhaps 12 examples exist across all grades.
The Philadelphia Mint also struck 20 proof examples for this date. Due to a higher survival rate than the circulation strikes, approximately an equal number of 1875 Proof Eagles exist. The difference between a circulated proof and circulation strike is noted by the placement of the date, particularly the first digit.
The finest known proof example graded NGC PF 65 Ultra Cameo sold for $172,500 at auction in January 2007.