1831

By 1831, the half eagle was settling into its third year on the reduced-diameter Kneass planchet, and the mint was running multiple reverse die punches to keep up with bullion deposits. Combined production for the year reached roughly 140,594 pieces across three separately cataloged issues: the standard 1831 (this entry), a Large 5D denomination logotype, and a Small 5D logotype. The two 5D varieties trace back to different working punches used on the reverse during the run, and modern catalogs treat each as a distinct collectible coin. The standard 1831 is the most accessible of the trio, but accessible is a relative word. Bass-Dannreuther and PCGS census data point to perhaps 50 to 100 examples surviving across all grades, with most in VF through AU and Mint State coins genuinely scarce.

Authentication for an 1831 starts with diameter, since this issue is sometimes confused with earlier Capped Head pieces struck on the wider open-collar planchets. A genuine coin measures 23.8 millimeters across and weighs 8.75 grams, with composition fixed at 0.9167 fine gold and the balance in copper and silver. A caliper reading outside the narrow 23.7 to 23.9 millimeter band is an immediate red flag and usually points to either a misattributed earlier issue or an outright forgery. The reeded edge should be sharp and evenly spaced, and specialists also examine the date logotype for digit spacing, since altered-date pieces sometimes show inconsistent kerning against authenticated reference images. At Semi-Key prices, a PCGS or NGC holder is essentially a requirement, and CAC verification adds meaningful resale support.

For modern collectors, the 1831 is a Semi-Key entry that surfaces mainly through major auctions and a handful of specialist dealers. Heritage and Stack's Bowers archives are the right places to track recent appearances and build a price baseline, and patience usually matters more than budget when waiting for a properly graded coin. Mid-grade circulated examples typically command strong four-figure prices, while problem-free AU and Mint State coins push well into the five-figure range. Date-set builders usually treat the standard 1831 as the gateway acquisition before pursuing the rarer Large 5D and Small 5D variants. Read more in our Capped Bust Half Eagle series history.