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IWC · Portofino

Strap for IWC Portofino IW4590-03

The Portofino Automatic Moon Phase 37 Red Gold / Black MOP 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 diameter37 mm
ReferenceIW4590-03 (aka: 4590-03, IW459003)
FamilyPortofino
MovementIWC caliber 35800 Hours, Minutes, Seconds | Moonphase
Year2014
CaseRed Gold

Spring bar

Swiss Standard universal spring bars

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

Standard spring bar · length 18 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Portofino Automatic Moon Phase 37 Red Gold / Black MOP — watch

Straps for the Portofino IW4590-03

Selected for the 18 mm lug width

All 18 mm straps →

What I'm asked about the IWC Portofino IW4590-03

What strap size does the IWC Portofino IW4590-03 take?

The IWC Portofino IW4590-03 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 IW4590-03 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 IW4590-03?

Yes, in 18 mm leather. On a 37 mm dress watch alligator is the natural choice: thin, elegant, what it was born for.

Which strap do you recommend for the IWC Portofino IW4590-03?

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.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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