1831 Proof

The 1831 Proof Capped Bust Dime is an R.7 rarity, a tier reserved for coins with roughly four to twelve verified survivors across all grades. No proof production figure was recorded for the year, and modern population data from the major grading services suggests that only a handful of examples exist today. These pieces were struck for presentation purposes, likely distributed to mint officials, visiting dignitaries, or early numismatists who arranged the order directly through the Philadelphia Mint. Recent auction appearances have landed in the mid-to-high five figures, with the strongest cameo specimens crossing into six-figure territory when condition and provenance align. The coin sits within the Small Type subgroup of the Capped Bust series, which used an 18.5 millimeter planchet introduced after the Mint adopted the steam-powered close collar press, a piece of equipment that produced sharper rims and a more uniform diameter than the earlier hand-screw method.

Authenticating an 1831 proof dime requires close attention to surface character rather than mintmark study, since the entire Capped Bust dime series was produced exclusively at Philadelphia and carries no mintmark. Genuine proofs show deeply mirrored fields that reflect light in a watery, glass-like manner, paired with squared and fully formed rims that meet the field at a near-perfect ninety-degree angle. The devices, meaning Liberty's portrait and the heraldic eagle, often display a layer of frosted texture called cameo, created when the polished die contacted a polished planchet under elevated striking pressure. Diameter must measure 18.5 millimeters and weight must fall at 2.7 grams in .8924 fine silver, the standard adopted under the Coinage Act revisions of the early 1830s. Reeded edges should appear crisp and evenly spaced, and any softness in the high points of the hair curls or eagle wing feathers is a warning sign. Holdered examples from the recognized third-party grading firms will bear a PR prefix on the label rather than MS, and collectors should verify that the holder designation matches the strike character visible under a loupe.

Designer John Reich introduced the Capped Bust portrait in 1809, and his work defined American small silver coinage through the early 1830s before the Mint transitioned to the Seated Liberty design. For broader context on the type, the proof emissions of this era, and the technical shifts that produced the Small Type planchet, see the Capped Bust Dime series history.