The highly innovative gasket system, which ensured almost absolute water resistance, formed the basis for these superb results. It uses natural cork which has been specially treated and which seals the crown, a weak point on all watches. By forming a perfect seal around the crown winding stem, Mido guarantees complete water resistance even if the crown is not pushed fully back in. From 1934 until a few years ago, this unique system proved its worth by protecting the precious mechanisms from water. In 1959, it was christened “Aquadura”.
As one of the earliest four-colour advertisements in Switzerland attests (the inside cover of the Zürcher Illustrierte no. 19 dated 12th May 1939), 1939 saw a whole host of innovations being released. This advert illustrates several versions of the Mido Multifort, including the Mido Datometer.