IWC · Portofino
Strap for Portofino Chronograph Stainless Steel / Silver / Milanese
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
20mm
Lug width20 mm
Case diameter42 mm
ReferenceIW3910-28 (aka: IW391028)
FamilyPortofino
MovementIWC caliber 75320
Hours, Minutes, Small Seconds | Date, Day | Chronograph
CaseStainless Steel
Straps for the Portofino IW3910-28 (aka: IW391028)
Selected for the 20 mm lug width · workshop selection
Green Rubberized Alligator Strap with Ecru Tribal Stitching€185
Novonappa Black Strap — IWC Pilot Style€149
Black Alligator Strap with Light Blue Edges€210
Black Alligator Strap with White Edges€210
Millenium Cognac Alligator Strap€270
The Portofino IW3910-28 (aka: IW391028), seen from the bench
The IWC Portofino IW3910-28 is a stainless steel chronograph with a 42mm case diameter and 20mm lug width. It features the IWC 75320 calibre movement, offering hours, minutes, small seconds, date and day indicators, plus chronograph function. The versatile design transitions seamlessly from formal to casual settings, while the stainless steel case develops a natural patina over time.
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