IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial"In the mid 1970s, IWC decided to redesign the Ingenieur to give it a more "fashion forward" look. With this new model, IWC aimed to emulate the success of one of its rivals. A few years earlier, Audemars Piguet had struck gold with the luxury steel sports watch, the "Royal Oak," designed by Grald Genta. In response, IWC brought Genta on board (who also designed the steel Patek Philippe Nautilus) to redesign the Ingenieur, along with two other models:
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IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial"