IWC · Portofino
Strap for Portofino Automatic 37 Stainless Steel / Ardoise / 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 diameter37 mm
ReferenceIW4581-10 (aka: 4581-10, IW458110)
FamilyPortofino
MovementIWC caliber 35111 hours, minutes, seconds | date
CaseStainless Steel
Straps for the Portofino IW4581-10 (aka: 4581-10, IW458110)
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 IW4581-10 (aka: 4581-10, IW458110), seen from the bench
The IWC Portofino IW458110 is a 37mm stainless steel automatic watch from the Portofino collection, featuring a clean dial, proportioned crown, and sharp hands. Powered by the manual-wind IWC 35111 caliber, it offers hours, minutes, seconds, and date function with water resistance to 60 meters. The 18mm lug width accommodates compatible aftermarket straps, while the robust stainless steel case and contained thickness make it suitable for both formal and everyday wear.
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