Over the following almost 50 years, IWC took Genta’s Ingenieur as the main inspiration for the Ingenieur. The design codes of the Ingenieur SL are so strong that they allowed IWC to slightly vary and alter the design without ever losing the legendary watch designers unique artistic signature. In 1983, for example, several new models were added to the collection, all of which represented a clear continuation of Genta’s design idiom. However, in keeping with clients tastes of the 1980s, the case size of the new Ingenieur SL was reduced to a much smaller diameter of 34 mm. Due to its thinness, this new Ingenieur SL was nicknamed “The skinny Ingenieur” by collectors.
Especially noteworthy is also the Ingenieur 500.000 A/m, which IWC developed in the mid-1980s with Swiss metallurgy specialists Prof. Steinemann and Dr. Straumann. This completely antimagnetic watch featured a hairspring made of a special niobium-zirconium alloy which was extremely challenging to manufacture. The model was tested in an MRI scanner and withstood an incredible 3.7 million A/m. IWC modestly called it the Ingenieur 500.000 A/m and released it in 1989 in a case size of 34 mm.