1859-S

San Francisco struck 15,200 quarter eagles dated 1859, a low figure for the western branch and one that places the issue in clear Semi-Key territory within the Coronet quarter eagle series. The California facility was concentrating production effort on larger gold denominations through the late 1850s, with double eagles absorbing most of the bullion the region delivered to federal coining operations. Quarter eagle production stayed modest as a result, and the 15,200-piece run for 1859 fell well below contemporary Philadelphia output for the same denomination. Working dies arrived from Philadelphia with the S mintmark hand-punched into the reverse below the eagle. Strike quality on 1859-S examples runs reasonably sharp on Liberty's portrait but typically shows softness on the eagle's wing tips and shield lines, a function of the relatively low pressure setup the western branch used for the smaller gold denominations.

Authentication centers on the S mintmark, which separates this San Francisco issue from the common 1859 Philadelphia production and the rarer 1859-D Dahlonega coin. The genuine San Francisco S is a small punched letter with sharp upper and lower curves, uniform stem thickness, and a centered position relative to the eagle's tail above. Counterfeiters add S mintmarks to host Philadelphia coins given the value differential, and the diagnostics follow standard added-mintmark protocols. Look for tooling disturbance in the surrounding field, a slight raised collar around the letter where solder or epoxy was used, incorrect S geometry compared to the confirmed San Francisco punch, or letter positioning that drifts from the standard die placement. Genuine pieces show the S as part of the original strike with no halo and no surface disturbance. Planchet specifications match the standard 4.18 grams at 0.900 fineness, 18 millimeters with a fully reeded edge.

Survivor estimates run between 175 and 250 examples across all grades, with most pieces falling in Very Fine through Extremely Fine and About Uncirculated coins reasonably available with patient searching. Mint State pieces are scarce, with combined PCGS and NGC populations showing only a modest count above MS-60 and Gem-grade examples genuinely rare. The 1859-S occupies a recognized place within the early San Francisco quarter eagle date set and commands Semi-Key pricing in any grade above Very Fine. See the full Liberty Head Quarter Eagle series history.