When a material needs to combine toughness with resilience, but still needs to be light, titanium is the best choice. The metal is enormously rugged and weighs about a third less than steel. Because of its skin-friendliness and anti-allergic properties, it is also used, among other things, for medical implants. All these properties virtually predestine titanium for use in watch cases. The challenge, however, is that the material is unusually hard and therefore difficult to machine. After every stage in the process, it needs to be soft-annealed or cooled down. In 1980, IWC unveiled the world’s first titanium wristwatch: IWC Porsche Design Titanchronograph (Ref. 3700). The engineers from Schaffhausen had acquired the expertise needed for its manufacture by liaising closely with experts from the French aviation and aerospace company Aérospatial. Since then, titanium watches have remained a fixed part of the portfolio, especially as members of the Pilot’s Watch and Ingenieur families.