How to Identify the 1851 Silver Three-Cent Piece

What It Is

Introduced in 1851, the silver three-cent piece, often nicknamed the "trime," was created to help make small postal and commercial transactions easier at a time when postage cost three cents. It is the smallest and thinnest silver coin the United States has ever regularly issued.

Obverse Design

The obverse shows a six-pointed star with a small shield in its center. "UNITED STATES OF AMERICA" runs around the border, and the date sits below the star. This first design, used from 1851 to 1853, has no additional outline or framing around the star, giving it a simple, uncluttered look.

Reverse Design

The reverse displays a large Roman numeral "III" set inside an ornamental scroll-like frame that curves around it, with a ring of thirteen stars near the border.

Size, Weight, Metal, and Edge

The 1851 issue is 75% silver and 25% copper, weighing only about 0.80 grams and measuring roughly 14mm across, with a plain edge. Its light weight and small size have earned it the nickname "fish scale" among collectors, and pieces are easily lost or overlooked in a coin jar.

Mint Marks

Most 1851 trimes were struck at Philadelphia and show no mint mark. A branch-mint version was also struck at New Orleans that year; those pieces carry a small "O" mint mark, located near the star design on the reverse.

Telling It Apart from Similar Coins

The 1851 design (Type I) is distinguished from later trimes by the absence of any outline around the star — from 1854 onward, the Mint added lines framing the star and small design changes to the reverse scroll. Because of its tiny size, this coin is also sometimes mistaken for a Half Dime, three-cent nickel, or even a small button; the star-and-shield obverse with a plain, unbordered star is the clearest tell for a genuine 1851 issue.

Judging Condition at a Glance

Given the coin's small size and low relief, check the points of the star and the shield lines at its center, along with the numeral "III" and scrollwork on the reverse, for crispness. Because trimes are thin and light, they can also show bends, creases, or edge nicks more readily than thicker coins, which should be factored into a condition assessment.

Authenticity Red Flags

Because trimes are small and low in silver content, outright fakes are less common than for larger silver coins, but watch for added "O" mint marks meant to mimic the scarcer New Orleans issue, or dates that have been altered from more common years. A coin that looks unusually thick, heavy, or has soft, mushy details compared to a well-struck example should be viewed with suspicion.