This Costa Rican airmail stamp, issued in 1976 with a face value of ₡5.00, honors the centenary of the first telephone communication (1876–1976). It features a bold, minimalist portrait of Alexander Graham Bell, the inventor of the telephone, rendered in black against a golden background. The inscription “Correo Aéreo” identifies it as part of Costa Rica’s airmail series. This commemorative issue celebrates one of humanity’s greatest achievements in communication, marking a century of technological progress that revolutionized global connectivity.