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IWC · Portofino

Strap for IWC Portofino IW3914-05

The Portofino Chronograph 39 Stainless Steel / Green 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 diameter39 mm
ReferenceIW3914-05 (aka: IW391405)
FamilyPortofino
MovementIWC caliber 79350 Hours, Minutes | Chronograph
Year2021
CaseStainless Steel

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 20 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Portofino Chronograph 39 Stainless Steel / Green — watch

Straps for the Portofino IW3914-05

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

What I'm asked about the IWC Portofino IW3914-05

What strap size does the IWC Portofino IW3914-05 take?

The IWC Portofino IW3914-05 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 IW3914-05 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 IW3914-05?

Yes, in 20 mm leather. On a 39 mm chronograph I like box calf: it holds its shape and carries a substantial case.

Which strap do you recommend for the IWC Portofino IW3914-05?

A 20 mm box calf. You'll find it ready in the 20 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