IWC Ingenieur SL ref. 9227 Linen Khanjar Dial from Original Owner Family with Box, Booklets, Original Certificate of Origin and Provenance in 18k yellow goldToday we have a rare watch to offer you but first, let us introduce the IWC Ingenieur. The first Ingenieur was launched in 1955 as IWC's first automatic watch with a soft iron inner case to protect against magnetic fields. It was designed for professionals such as engineers and scientists who worked in environments with strong magnetic interference. In 1976, Grald Genta redesigned the watch to create the Ingenieur SL (reference 1832). This version