This 20 centimes stamp from the République Rwandaise, issued in 1974, celebrates Guglielmo Marconi’s famous yacht-laboratory Elettra. The vessel, depicted sailing against a green and blue backdrop, served as Marconi’s floating laboratory for pioneering radio wave experiments. The left panel shows stylized radio waves, symbolizing the birth of wireless communication. Designed by J. Van Noten, this issue honors the spirit of scientific exploration and technological progress that transformed global communication.