IWC · Portofino
Strap for Portofino Hand-Wound Eight Days Stainless Steel / Silver
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 diameter45 mm
ReferenceIW5101-03 (aka: 5101-03, IW510103)
FamilyPortofino
MovementIWC caliber 59210
Hours, Minutes, Small Seconds | Date | Power Reserve Indicator
CaseStainless Steel
Straps for the Portofino IW5101-03 (aka: 5101-03, IW510103)
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 IW5101-03 (aka: 5101-03, IW510103), seen from the bench
The IWC Portofino IW5101-03 is a 45mm stainless steel timepiece from the Portofino collection, originally inspired by the Ligurian coastline in the 1980s. It features the IWC caliber 59210, an automatic movement with hours, minutes, small seconds, date display, and power reserve indicator, offering ±5 seconds daily precision and approximately 42 hours of power reserve. The watch has a 20mm lug width and a 316L stainless steel case designed for refined wrist presence and optimal strap compatibility.
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