Coins of Intrigue: Unveiling America's 10 Most Uncommon Mints

Bullion Coins

These coins, including Silver Eagles, Gold Eagles, Platinum Eagles, and Gold Buffalos, are made entirely of precious metals and are not circulated for general use. They are intended for investment, based on the market value of their metal content.


Proposed but never circulated, the $100 Union and $50 Half-Union were considered after the California gold rush to help integrate the state financially with the rest of the U.S. A couple of Half-Unions were found, but their purpose remains a mystery.

Eagle Coins

Minted from 1792 to 1933, Eagle Coins included denominations like the $10 eagle, $20 double-eagle, $5 half-eagle, and $2.50 quarter-eagle. They were phased out when gold possession was restricted during the Great Depression.

Stella ($4 Coin)

An experimental coin meant to align with the Latin Monetary Union's standards. The Stella was a concept that never saw circulation after Congress rejected the idea.

Three-Dollar Piece

Minted between 1854 and 1889, this coin was peculiar for its denomination and was theorized to have been created for purchasing stamps after their price was reduced to three cents.

Twenty-Cent Piece

Lasting only from 1875 to 1878, this coin was an attempt to match European coinage for international parity but was quickly abandoned due to its redundancy with the quarter.


Produced from 1792 to 1873, the half-dime was replaced by the nickel, a five-cent coin made of a nickel alloy, which became more popular and led to the half-dime's discontinuation.

Three-Cent Piece

Existing in both silver and nickel versions from 1851 to 1889, this coin was initially minted to match the price of stamps. It was eventually phased out as stamp prices changed and the coin became unnecessary.

Two-Cent Piece

Minted briefly after the Civil War, from 1864 to 1873, the two-cent piece was a stopgap to alleviate coin shortages. Its use dwindled rapidly, and it was discontinued.

Sacagawea Dollar (2000)

While not short-lived, the introduction of the Sacagawea dollar marked a significant change in dollar coinage, transitioning from the Eisenhower design. Its notable introduction year highlights the ongoing evolution of U.S. coinage.