This 4¢ violet commemorative stamp was issued by the United States in 1960 to honor Echo I, the world’s first passive communications satellite. The design features Earth, radio waves, and the large reflective satellite that symbolized a leap forward in space technology. Inscribed with “Communications for Peace,” it highlights the promise of science serving humanity during the early Space Age. A Cold War–era issue, it also reflects America’s aspirations for peaceful applications of space exploration. A must-have for collectors of U.S. commemoratives, space-themed philately, and Cold War history.