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IWC · Portofino

Strap for IWC Portofino IW5101-03

The 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
20 mm strapsAll IWC
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Lug width20 mm
Case diameter45 mm
ReferenceIW5101-03 (aka: 5101-03, IW510103)
FamilyPortofino
MovementIWC caliber 59210 Hours, Minutes, Small seconds | Date | Power reserve indicator
Year2011
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the Portofino IW5101-03

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

What I'm asked about the IWC Portofino IW5101-03

What strap size does the IWC Portofino IW5101-03 take?

The IWC Portofino IW5101-03 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the IWC Portofino IW5101-03 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the IWC Portofino IW5101-03?

Yes, in 20 mm leather. On a 45 mm dress watch alligator is the natural choice: thin, elegant, what it was born for.

Which strap do you recommend for the IWC Portofino IW5101-03?

A thin 20 mm alligator. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

The Portofino IW5101-03, 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.

Frequently asked questions

What is the best strap for the IWC Portofino IW5101-03?

For the Portofino IW5101-03 in stainless steel, we recommend a Mississippi alligator with naturally articulated grain or a box calf that develops patina over time. Both materials enhance the proportions of the 45mm case without visually weighing down the wrist. The choice depends on the context of use: the former for formal elegance, the latter for daily versatility.

Can I use an aftermarket strap compatible with the IWC Portofino IW5101-03?

Yes, any strap with a 20mm lug width is compatible with the Portofino IW5101-03. Milano Straps artisanal straps are made in Italy with premium leathers and allow complete personalization: choose the material, color, initials, and thread color according to your personal taste.

How long does a leather strap last on the IWC Portofino IW5101-03?

A quality leather strap (alligator or calf) worn daily lasts an average of 3-5 years before requiring replacement. Durability depends on the type of leather, frequency of use, and care. Milano Straps artisanal straps include an 18-month warranty and maintain excellent condition with periodic cleaning using soft, dry cloths.

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

Bespoke straps for IWC, in the atelier or by video call: casatimilano.com