Millard Fillmore (1800-1874), the thirteenth president of the United States, appears on the 13-cent denomination of the 1938 Presidential Series. The Postal Service issued the stamp in sheet form on September 22, 1938. A bust displayed in the Senate Gallery of the U.S. Capitol inspired the stamp's vignette. This was Millard Fillmore's first appearance on a postage stamp.
Vice President Fillmore became president upon the death of John Tyler. He served out the term (1849-1850) but was not elected to another term. Gold was discovered in California during his presidency.
While the 13-cent value saw use in combination with other stamps, especially on fourth-class mail. For instance, a first-class, special delivery cover could have been properly paid with a combination rate in effect November 1, 1944, through December 31, 1948. Stamps having solo usage are difficult to find.