1864-S

San Francisco struck 230,000 dimes in 1864, the wartime branch-mint figure that carries this date into Key territory in the Seated Liberty series. Philadelphia delivered only 11,470 business strikes the same year, so the Pacific Coast actually produced roughly twenty times as many dimes as the parent mint. That arithmetic reflected geography rather than ambition. Eastern silver had vanished into private hoards from the specie suspension of December 30, 1861, and a Treasury Note that bought less every quarter, while California and the Nevada Territory continued transacting in metal as a matter of custom and statute. The 1864-S left the press into a working monetary system, circulated hard through waterfront commerce and mining payrolls, and almost none of the run was saved as collector material at the time.

Strike on the 1864-S follows the established San Francisco pattern of softness across Liberty's head and the upper-obverse legend, with the eagle absent from the design entirely under the Legend obverse format introduced in 1860, where UNITED STATES OF AMERICA replaces the thirteen stars and the wreath fills the reverse. Authentication rests on the 2.49-gram weight set by the Coinage Act of February 21, 1853, a 17.9-millimeter diameter, the standard reeded edge, and the S mintmark positioned within the wreath on the reverse below the bow. Added-mintmark fakes built from worn Philadelphia 1864 dimes are the documented counterfeit vector, so the field around the mintmark should sit clean of tooling halos and the punch itself should match documented San Francisco mintmark styles for the year. PCGS, the Professional Coin Grading Service, and NGC both maintain population reports that show heavy concentration in Good through Very Fine, with Extremely Fine and About Uncirculated examples turning up irregularly and Mint State survivors limited to a small handful.

The 1864-S is a Key Date that collectors typically buy certified in circulated grades, where the population is broad enough to permit eye-appeal selection without paying a condition premium and the price ladder runs steeply from there. Raw examples are best avoided unless the buyer can read S mintmark authenticity cold. For the broader story of Gobrecht's design, the Civil War-era production, and the Carson City Mint, see the Seated Liberty Dime series history.