Issued in 1960, this striking purple U.S. postage stamp commemorates Project Echo I, the world’s first passive communications satellite. The design shows radio waves bouncing between Earth and the large reflective satellite, symbolizing humanity’s leap into global communication. Bearing the inscription “Communications for Peace”, it captures the optimism of the early Space Age, when scientific progress was seen as a bridge toward international understanding. This 4-cent commemorative remains a classic in American space and technology philately.