IWC · Ingenieur
Strap for Ingenieur SL Automatic Stainless Steel / Yellow Gold / White / Bracelet
Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
21mm
Lug width21 mm
Case diameter34 mm
ReferenceIW3505-11 (aka: IW350511)
FamilyIngenieur
MovementIWC caliber 375 hours, minutes, seconds | date
Year1983 - 1990
CaseYellow Gold, Stainless Steel
The Ingenieur IW3505-11 (aka: IW350511), seen from the bench
The IWC Ingenieur IW3505-11, designed by Gérald Genta in 1976, features a tonneau case combining yellow gold and stainless steel with visible screws on the caseback. The automatic IWC caliber 375 movement provides hours, minutes, seconds, and date display. The 34mm case diameter maintains elegant proportions characteristic of Genta's design philosophy. The watch accommodates a 21mm lug width, a specific dimension balancing the compact case size with visual rigidity, allowing customization with leather straps or the signature Ingenieur bracelet.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only