IWC · Portofino
Strap for Portofino Chronograph Stainless Steel / Black / Milanese
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
ReferenceIW3910-10 (aka: 3910-10, IW391010)
FamilyPortofino
MovementIWC caliber 75320 hours, minutes, small seconds | date, day | Chronograph
Year2011 - 2019
CaseStainless Steel
Straps for the Portofino IW3910-10 (aka: 3910-10, IW391010)
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
Hammered calfskin strap in cuoio€98
Saffiano Red Strap Ecru Stitching€90
The Portofino IW3910-10 (aka: 3910-10, IW391010), seen from the bench
The IWC Portofino IW3910-10 is a Swiss dress chronograph featuring a 42 mm stainless steel case and an 18 mm lug width. It houses the calibre 75320, an in-house automatic movement with hours, minutes, small seconds subdial, date and day windows, and a 30-minute chronograph totalizer. The watch combines functional precision with refined design, offering water resistance to 30 metres and sapphire crystal with anti-reflective coating.
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