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IWC · Portofino

Strap for IWC Portofino IW5101-11

The Portofino Hand-Wound Eight Days Tribeca Film Festival 2015 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
ReferenceIW5101-11 (aka: 5101-11, IW510111)
FamilyPortofino
MovementIWC caliber 59210 Hours, Minutes, Small seconds | Date | Power reserve indicator
Year2015
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 IW5101-11

Selected for the 18 mm lug width

All 18 mm straps →

What I'm asked about the IWC Portofino IW5101-11

What strap size does the IWC Portofino IW5101-11 take?

The IWC Portofino IW5101-11 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 IW5101-11 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 IW5101-11?

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 IW5101-11?

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 IW5101-11, seen from the bench

The Portofino represents IWC's classic line with an essential and refined design. It mounts the IWC caliber 59210 with power reserve indicator, small seconds and date display. The case features traditional proportions with a clean and readable dial.

Frequently asked questions

What is the best strap for the Portofino IW5101-11?

The best strap depends on the intended use. For formality and elegance: dark brown or burgundy alligator. For everyday versatility: grey-tortora calf or Tuscan vegetable-tanned leather. For sports practicality: navy NATO or black rubber. The stainless steel case of the Portofino pairs perfectly with medium to high-thickness leathers and refined textures.

Which aftermarket strap is compatible with the Portofino IW5101-11?

All straps with an 18mm lug width are compatible with the Portofino IW5101-11. Milano Straps offers a specialized selection of artisanal 18mm straps in alligator, calf, NATO and rubber, customizable in sizes, initials and stitching threads, with fast shipping and warranty.

How long does a leather strap last on the Portofino IW5101-11?

A quality leather strap, when regularly used on a watch like the 45mm Portofino, lasts on average 3-5 years before requiring replacement. Durability depends on intensity of use, climate, humidity and leather quality. Tuscan vegetable-tanned leathers and natural alligator age gracefully and can be restored by specialized craftsmen. Calf straps have similar durability. FKM rubber lasts longer, up to 6-8 years with ordinary use.

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