The Carson City Mint struck Seated Liberty Dollars for only four years from 1870 to 1873. All issues have low mintages, however the 1873-CC Seated Liberty Dollar (Buy on eBay) ranks as the rarest, with the lowest number of survivors.
The reason for the rarity is presumed to be the enactment of the Coinage Act of 1873, which ended the production of silver dollars. From the original mintage of 2,300 pieces, it is believed that perhaps only 750 to 1,000 examples made it out of the United States Mint while the rest were melted. Fewer than 100 examples are believed to have survived across all grades, including only five examples in uncirculated grades.
One of the uncirculated 1873-CC Silver Dollars graded MS61 by NGC sold for $105,750 at an auction held in 2015.