The medal's obverse bears bust of Brevet Colonel James Duncan,r., die crack runniing through bust from approx. 11 o'clock to 5 o'clock. Around, PALO ALTO, RESACA DE LA PALMA, MONTEREY, VERA CRUZ, CERRO GORDA, SAN ANTONIO.; to left and right of bust, BREVET COL. - JAMES DUNCAN. Signed under truncation, C.C. WRIGHT SC.; and at bottom, S. ELLIS DEL.
The reverse bears legend only. Around, CITY OF MEXICO, GARITA BELEN, GARITA COSME, CHAPULTEPEC, MOLINA DEL REY, CHERUBUSCO.; across, PRESENTED BY / THE CITIZENS OF N.YORK / TO / BREVT. COL. JAMES DUNCAN / OF THE / UNITED STATES ARMY / DEC. 28TH. 1848.
James Duncan (d. 1849) graduated from the United States Military Academy in 1834. Two years later, he served in the Florida war against the Seminole Indians and commanded an artillery company during the war with Mexico from 1846 to 1848. His heroics in the latter conflict caught the attention of army officials, and Duncan rose rapidly from captain to colonel. In late 1848, President James Polk appointed Colonel Duncan inspector general of the United States Army.
The medal was given to him just before his first tour of inspection when he visited New York. He died only months later from Yellow Fever which he contracted from troopers in Mobile, Alabama.
The circular medal measures 53.4mm in diameter and was struck in bronze by the U.S. Mint. No mintage is reported, but the large die crack would argue for a small production run.