7.4M views · 8.9K reactions | The Ingenieur Perpetual Calendar 41 (Ref. IW344903) is the first stainless-steel model to combine Gérald Genta’s Ingenieur design with the perpetual calendar developed by Kurt Klaus. This legendary complication is composed of only around 80 parts, and all displays can be adjusted simply by turning the crown. #IWCwatches | #IWCingenieur | #FormUndTechnik | IWC Schaffhausen | Facebook