This 50-centime Swiss commemorative stamp, issued in 1968, celebrates the 75th anniversary of the Office International des Chemins de Fer (OCTI), founded in 1893 to coordinate international railway transport. Designed by Werner Muehlmann and printed by Courvoisier S.A., it features a stylized railway wheel with directional arrows and the acronym “OCTI” in gold, symbolizing global rail connectivity. The minimalist blue design reflects Swiss modernist aesthetics and precision. A hallmark of Switzerland’s tradition in honoring international cooperation through philately.