This 21-cent United States postage stamp features Chester Alan Arthur, the 21st President of the United States (1881–1885). It belongs to the 1938 “Presidential Series” or “Prexies,” a definitive issue honoring all U.S. presidents up to that time. Designed in a striking red, white, and blue color scheme, it portrays Arthur’s dignified portrait framed by ornate laurel motifs. The series was widely used for regular mail and remains a classic in American philately, prized for its design uniformity and historical completeness.