IWC · Portofino
Strap for Portofino Chronograph Stainless Steel / Black
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
ReferenceIW3910-02 (aka: IW391002)
FamilyPortofino
MovementIWC caliber 79230
Hours, Minutes, Small Seconds | Date, Day | Chronograph, Rattrapante
CaseStainless Steel
The Portofino IW3910-02 (aka: IW391002), seen from the bench
The IWC Portofino IW391002 is a sophisticated chronograph from the Swiss manufacture, featuring a 42 mm stainless steel case with the proprietary caliber 79230 movement. The watch includes chronograph functions, date, day of week, and tachymeter scale, with a flyback seconds complication. The 18 mm lug width accommodates various strap options, from leather to fabric NATO styles, maintaining the classic elegance characteristic of the Portofino family since the late 1990s.
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