IWC · Portofino
Strap for Portofino Automatic 37 Red Gold / 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 diameter37 mm
ReferenceIW4581-05 (aka: 4581-05, IW458105)
FamilyPortofino
MovementIWC caliber 35111 hours, minutes, seconds | date
CaseRed Gold
Straps for the Portofino IW4581-05 (aka: 4581-05, IW458105)
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 IW4581-05 (aka: 4581-05, IW458105), seen from the bench
The IWC Portofino Automatic 37 Red Gold reference IW4581-05 features a 37 mm 18K rose gold case with a classic dress watch design from the 1960s Côte d'Azur aesthetic. It is equipped with the IWC caliber 35111, a manual-winding mechanical movement providing hours, minutes, seconds, and date. The 18 mm lug width is standard for dress watches and ensures visual harmony between case width and wrist thickness.
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