IWC · Portofino
Strap for Portofino Chronograph Stainless Steel / Silver
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
18mm
Lug width18 mm
Case diameter42 mm
ReferenceIW3910-01 (aka: IW391001)
FamilyPortofino
MovementIWC caliber 79230 hours, minutes, small seconds | date, day | Chronograph, Rattrapante
Year2011 - 2015
CaseStainless Steel
Straps for the Portofino IW3910-01 (aka: IW391001)
Selected for the 18 mm lug width
Hammered Calfskin Strap Light Blue€98
Vintage Brown Calfskin Strap — Natural Patina€98
Hammered Pink Strap with Ecru Stitching€98
Hammered Yellow Strap with Ecru Stitching€98
Grey Hammered Leather Strap with Ecru Stitching€98
Swift Red Leather Strap€120
The Portofino IW3910-01 (aka: IW391001), seen from the bench
The IWC Portofino IW3910-01 is a stainless steel chronograph featuring the in-house caliber 79230 automatic movement with split-seconds function. The 42mm AISI 316L stainless steel case embodies refined Mediterranean design philosophy, with visible finishing details through the transparent caseback. The 18mm lug width is proportionally calibrated to the case diameter, ensuring a balanced aesthetic without lateral overhang when paired with appropriate straps.
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