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IWC · Portofino

Strap for IWC Portofino IW5101-14

The Portofino Hand-Wound Eight Days Beijing International Film Festival 2016 takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

18mm
18 mm strapsAll IWC
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Lug width18 mm
Case diameter45 mm
ReferenceIW5101-14 (aka: IW510114)
FamilyPortofino
MovementIWC caliber 59210 Hours, Minutes, Small seconds | Date | Power reserve indicator
Year2016
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 IW5101-14

Selected for the 18 mm lug width

All 18 mm straps →

What I'm asked about the IWC Portofino IW5101-14

What strap size does the IWC Portofino IW5101-14 take?

The IWC Portofino IW5101-14 needs 18 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 IW5101-14 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 IW5101-14?

Yes, in 18 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 IW5101-14?

A thin 18 mm alligator. You'll find it ready in the 18 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

The Portofino IW5101-14, seen from the bench

The IWC Portofino Hand-Wound Eight Days Beijing International Film Festival 2016 (ref. IW5101-14) is a contemporary dress watch featuring a 45mm stainless steel case with a 18mm lug width. Powered by the reliable IWC 59210 automatic movement, it displays hours, minutes, small seconds on a subdial, date at 3 o'clock, and power reserve indicator. The dial combines clean geometry with excellent legibility, while the satin-brushed case with polished edges reflects meticulous finishing.

Frequently asked questions

Is there an aftermarket strap compatible with the Portofino IW5101-14?

Yes. All straps with an 18mm lug width are compatible with the Portofino IW5101-14. Milano Straps offers an extensive online collection of artisanal 18mm straps: alligator leather, calf, NATO fabric, and structured rubber. Each strap is customizable in length, stitching thread, and initials. You can also contact Casati Milano for bespoke consultation with direct viewing of available materials.

How long does a leather strap last on the Portofino IW5101-14?

A high-quality tailored leather strap lasts 3-5 years with daily use, longer if worn occasionally. Longevity depends on the material: alligator with tight fibers ages more gracefully; vegan calf requires protection from humidity. Leather needs periodic rest (at least rotating with a second strap) to dissipate absorbed moisture. Milano Straps and Casati Milano straps include an 18-month warranty and recommended maintenance via WhatsApp.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only

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