1861-S

The 1861-S half eagle was struck during the opening months of the Civil War, with Fort Sumter falling in April and the country splitting along sectional lines. The San Francisco Mint kept its rhythm through the upheaval. California stayed in the Union, the West Coast was geographically insulated from Confederate operations, and production at the seven-year-old branch mint was paced by bullion deposits rather than war disruption. The 18,000-piece mintage is among the lowest of the entire San Francisco half eagle run and closes a four-year cluster of scarce dates that includes the 18,600-coin 1858-S, the 13,220-coin 1859-S, and the 21,200-coin 1860-S. Double eagles absorbed most of the gold flowing into the building, leaving $5 production a secondary priority.

Authentication starts with the standard Coronet Liberty specifications: 8.359 grams, 21.6 millimeters, 90% gold and 10% copper, with a reeded edge. A genuine coin should land within roughly two-tenths of a gram of standard; any meaningful underweight reading is a red flag. Two diagnostics matter most for a Semi-Key like this one. First, study the S mintmark on the reverse, below the eagle. Metal flow should tie cleanly into the surrounding field; a mintmark that looks pasted on or shows tooling marks at the base is a warning for an added-mintmark alteration from a Philadelphia 1861. Second, check the luster. San Francisco coins of this era carry a frosty, slightly muted glow rather than the brighter cartwheel of Philadelphia strikes, and a uniform shine without that broken character usually points to a cleaning.

Doug Winter places the surviving population at roughly 60 to 70 coins across all grades, in line with the 1858-S and 1860-S and well above the rarer 1859-S. Most known examples grade VF to XF, About Uncirculated coins are scarce, and Mint State pieces are rare enough that any appearance draws attention. Heritage and Stack's Bowers archives show pleasing XF examples trading in the mid-four figures, AU coins reaching well into five figures, and the occasional Mint State survivor pushing higher still. For collectors building a San Francisco No Motto half eagle set, the 1861-S is a meaningful but achievable step up from common dates and a clean fit alongside its peers. For more background, see the Liberty Head Half Eagle series history.