IWC · Portofino
Strap for IWC Portofino IW3731-06
The Portofino Chronograph MecaQuartz Stainless Steel / White / Bracelet takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
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- Ships in 1–3 working days
- Worldwide shipping
- 30-day returns
- 12-month warranty on manufacturing defects
- Hand-stitched in Milan
Lug width
Your watch with our straps
Calf, Brown
Vintage Brown Calfskin Strap — Natural Patina
€98
★ 4.9 · 11
1 / 51
Real photos of the strap and the case. No generated images.
What length do I need?
Measure your wrist with a tailor's tape or a piece of string, comfortably snug.
| Wrist circumference | Length (long side / short side) |
|---|---|
| 15.0–16.4 cm | 120 / 70 mm |
| 16.5–17.8 cm | 125 / 75 mm |
| 17.9–19.0 cm | 130 / 80 mm |
| 19.1–20.3 cm | 135 / 85 mm |
| 20.4–21.6 cm | 140 / 85 mm |
| 21.7–22.9 cm | 145 / 90 mm |
The ready-to-wear strap is 115 × 75 mm. For a smaller or larger wrist I make it in the right length: order your length.
What I'm asked about the IWC Portofino IW3731-06
What strap size does the IWC Portofino IW3731-06 take?
The IWC Portofino IW3731-06 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 IW3731-06 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 IW3731-06?
Yes, in 18 mm leather. On a 35 mm chronograph I like box calf: it holds its shape and carries a substantial case.
Which strap do you recommend for the IWC Portofino IW3731-06?
A 18 mm box calf. You'll find it ready in the 18 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More Portofino
- Portofino Ultra-Thin Yellow Gold18 mm
- Portofino Quartz Yellow Gold18 mm
- Portofino Quartz Stainless Steel18 mm
- Portofino Perpetual Calendar Stainless Steel / Silver20 mm
- Portofino Perpetual Calendar Rose Gold / Silver20 mm
- Portofino Automatic Yellow Gold / White / Strap18 mm
- Portofino Automatic Yellow Gold / Champagne / Strap18 mm
- Portofino Automatic Yellow Gold / Black - Pilot / Strap18 mm
More IWC in 18 mm
- Ingenieur 666AD Stainless Steel / BlackIngenieur
- Ingenieur SL Jumbo Stainless Steel / BlackIngenieur
- Ingenieur Automatic AMG Black Series CeramicIngenieur
- Ingenieur Automatic Titanium / CLS55 / BraceletIngenieur
- Ingenieur Automatic Stainless Steel / JapanIngenieur
- Ingenieur Automatic Climate ActionIngenieur
For changing the strap
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