How to Identify the Panama-Pacific Exposition Quarter Eagle

Begin with the obverse, which is the strongest diagnostic. A genuine Panama-Pacific quarter eagle shows a female figure (Columbia) riding a hippocamp — a sea-horse with a horse's front and a curling fish tail — and holding a caduceus staff. The inscription 'PANAMA-PACIFIC EXPOSITION' arcs around the design and the date is 1915. No regular-issue U.S. gold coin carries this mythological maritime scene, so it is a quick and reliable confirmation.

Turn to the reverse, which must show a standing eagle with spread wings on a standard, the motto 'E PLURIBUS UNUM', 'UNITED STATES OF AMERICA', and the denomination written as '2½ DOL'. Look for the 'S' mint mark that marks the San Francisco Mint. If the reverse reads '1 DOL' or shows a different design, you are looking at a different Pan-Pac issue, not the quarter eagle.

Check size and metal. The quarter eagle is a small coin, about 18 mm across, and is struck in 90% gold with a reeded edge, so it should feel dense for its size and show a rich yellow tone. It is much smaller than the exposition's $50 pieces and distinct from the Pan-Pac gold dollar, which uses a different obverse portrait.

Watch for look-alikes and reproductions. Because this is a valuable gold commemorative, counterfeits, cast copies, and gold-plated fakes exist. Warning signs include incorrect weight or diameter, mushy or seamed detail, a wrong-color surface, or any magnetic response (genuine gold is non-magnetic). Souvenir 'copies' may also lack the sharp relief of a struck coin.

For any significant purchase, rely on authentication rather than eye appeal. Weigh and measure the coin, compare it to reference images of a certified example, and for higher-value pieces insist on third-party grading (PCGS or NGC) and reputable dealers. The combination of the correct obverse allegory, 1915 date, 'S' mint mark, '2½ DOL' reverse, and correct physical specifications together confirms a genuine coin.