1840-O

The 1840-O Liberty Head half eagle holds the distinction of being the first $5 gold coin struck at the New Orleans Mint. The facility had opened in 1838 and spent its first two years processing $10 eagles, half dollars, and dimes, but no $5 gold pieces. When half eagle production finally began in 1840, the New Orleans coiners turned out 40,120 examples bearing the small "O" mintmark. The Mint sat near the Mississippi River wharves and drew bullion from the cotton trade, Mexican silver shipments, and gold reaching the port from across the Gulf, so the building was strategically placed to convert raw metal into circulating coin without sending it north to Philadelphia.

The "O" mintmark sits on the reverse just below the eagle. On a genuine 1840-O the letter is sharply cut and seated cleanly into the field, with no rough metal around its base. Counterfeiters have long targeted New Orleans gold by tooling an "O" onto a Philadelphia coin of the same date, so authenticators check the area under magnification for grain disruption, raised metal at the edges of the letter, or a mintmark that floats above rather than into the field. The 1840-O also exists in two edge varieties: a scarcer "broad mill" with a wider rim diameter carried over from 1839 dies, and the standard "narrow mill" measuring 21.6 mm. Weight on either variety should land at 8.359 grams.

Most surviving 1840-O half eagles grade in the lower circulated range, with VF and EF examples appearing at major auctions a few times a year. AU coins sell into the low four figures, and uncirculated pieces are genuinely rare, with Doug Winter noting that the few high-grade examples known have not surfaced publicly in many years. The coin is often overlooked by collectors who chase later New Orleans rarities, which keeps prices reasonable relative to its first-year status. For broader context on this denomination, see our Liberty Head Half Eagle series history.