1980s IWC Ingenieur SL 18K YG (Ref. 9230) Black "Graph Paper" Dial

Founded more than 150 years ago, International Watch Company has grown into one of the most recognizable names in Swiss watchmaking. While the brand is widely associated with pilot’s watches, dive watches, and elegant dress pieces, the Ingenieur was conceived as something entirely different: a purpose-built, anti-magnetic tool watch designed for scientists and engineers. The first Ingenieur debuted in the 1950s with the ref. 666, presenting a restrained, almost dress-like aesthetic while housing a movement protected against magnetic fields, an essential feature for technical professionals of the era.

The model’s defining moment arrived in 1976, when legendary watch designer Gerald Genta reimagined the Ingenieur into the now-iconic Ingenieur SL. Featuring Genta’s unmistakable integrated bracelet architecture and a bold, industrial case design, the SL transformed the Ingenieur into a true luxury sports watch while preserving its technical roots. The ref. 9230 presented here elevates that formula further with an 18K yellow gold case and bracelet, paired with a striking black “graph paper” dial whose finely gridded texture adds both visual depth and a distinctly technical character. Bridging tool-watch heritage with the refined design language of the late 1970s and early 1980s, the Ingenieur SL remains one of the most compelling expressions of Genta’s influential design era.