Ron Guth:
The 1878-CC was the last Quarter Dollar produced at the Carson City Mint. It is not a rare coin, but the demand for the CC-mintmark has boosted this date's popularity, especially in high grade.
Most 1878-CC Quarter Dollars are well-struck and feature a frosty luster. One interesting variety shows a raised die line running diagonally upwards from Liberty's left knee (viewer's right) across her belly to just above the elbow of her right arm (viewer's left).
Collectors should have no trouble locating Mint State examples in grades up to and including MS64. Gem examples are scarce, but mostly expensive. The finest example is the colorful PCGS MS67 illustrated above.