IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial" leather-straps The watch is housed in

The watch is housed in a waterproof 36mm case with cylindrical pushers and large size winding crown

der die Seele des aktuellen Themas widerspiegelt

- Original Piaget leather strap and white gold Piaget buckle

dating to 1967

and a small seconds subdial at 6 o’clock

IWC Ingenieur SL Automatic Ref 3506 Grey "Graph Paper Dial" leather-straps The watch is housed inIn 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: