IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial" lug-width-in-mm-19 there's an abundance of terminology

there's an abundance of terminology

Colour change in heavy metal…

The watch houses an AP ultra-thin manual-wind movement

- Stunning grey soleil dial

IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial" lug-width-in-mm-19 there's an abundance of terminologyIn 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: