IWC Portofino Chronograph

The strap size depends on the reference. Yours is engraved on the case back or between the lugs at 6 o'clock.

18 or 20 mm

Verification: Listed by the maker for ref. IW3910‑05

35 to 42 mm cases · 2015 to 2022

Official page: IWC

Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.

Collection31 references

Illustration drawn to scale: 42 mm case, 20 mm lugs

31 IWC Portofino Chronograph references

IWC Portofino Chronograph references in our database. Each card says where its width comes from: listed by the maker (linked to the maker's page in the details), two independent sources agree, or listed in our database and not yet verified by us.

IW3910‑19

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmBlue / Navy dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW9531‑01

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3783‑03

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 41 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑05

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3783‑02

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 41 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑06

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑04

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑08

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑03

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3914‑08

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 39 mmBlue / Navy dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑06

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑22

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑07

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑01

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3731‑01

Portofino Chronograph Portofino

Lug width: 18 mm
Source: Database

Case size: 35 mmWhite dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑33

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑20

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑32

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑62

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑34

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑02

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW3910‑05

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Maker

Grey dial

Attachment
classic lugs

Status
Listed by the maker
IW3910‑09

Portofino Chronograph Portofino

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW391010

Portofino Chronograph

Lug width: 20 mm
Source: Database

Case size: 42 mmBlack dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW391021

Portofino Chronograph

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dial

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW391502

Portofino Chronograph 39

Lug width: 18 mm
Source: Database

Case size: 39 mmYear: 2022Green dialCase material: Steel

Attachment
classic lugs
Style
chrono
Movement
Automatic Chronograph
Caseback
Display back
Production
2022, present

Status
Listed in our database, not yet verified
IW391030

Portofino Chronograph Blue

Lug width: 20 mm
Source: Database

Case size: 42 mmYear: 2015Blue dialCase material: Steel

Attachment
classic lugs
Style
chrono
Movement
Automatic Chronograph
Caseback
Display back
Production
2015, present

Status
Listed in our database, not yet verified
IW391027

Portofino Chronograph Silver

Lug width: 20 mm
Source: Database

Case size: 42 mmYear: 2015Silver dialCase material: Steel

Attachment
classic lugs
Style
chrono
Movement
Automatic Chronograph
Caseback
Display back
Production
2015, present

Status
Listed in our database, not yet verified
IW391031

Portofino Chronograph Schaffhausen Portofino Chronograph 42mm Steel

Lug width: 20 mm
Source: Database

Case size: 42 mmGrey dialCase material: Steel

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW391036

Portofino Chronograph Schaffhausen Portofino Chronograph 42mm Steel

Lug width: 20 mm
Source: Database

Case size: 42 mmBlue / Navy dialCase material: Steel

Attachment
classic lugs

Status
Listed in our database, not yet verified
IW391037

Portofino Chronograph Schaffhausen Portofino Chronograph 42mm Steel

Lug width: 20 mm
Source: Database

Case size: 40 mmWhite dialCase material: Steel

Attachment
classic lugs

Status
Listed in our database, not yet verified

FAQ

What lug width does the IWC Portofino Chronograph use?

IWC Portofino Chronograph lug width: 18 or 20 mm depending on the reference. The most common is 20 mm (23 of the 31 references with a listed width in our database). Find your exact reference in the table below. The IWC Portofino Chronograph ref. IW3910-05 takes 20 mm (listed by the maker).

Do all IWC Portofino Chronograph references take the same strap?

No. 2 different lug widths appear across the line, often by case size or generation. Check the reference engraved on the case back or between the lugs.

Where do these IWC Portofino Chronograph lug widths come from?

From our database, which lists 31 IWC Portofino Chronograph references, 31 of them with a listed width. Each reference card says whether the maker lists the width, two independent sources agree on it, or it is not yet verified.

Other IWC collections

All IWC collections

Help

What is lug width?

The gap between the two lugs that hold the strap, in millimetres. A new strap must match it exactly: 20 mm lugs take a 20 mm strap.

Measure it in 30 seconds

Take the strap off, or look at the back of it: many straps print their width.
Measure the inside gap between the lugs with a caliper or a millimetre ruler.
Round to the nearest whole millimetre. Most watches use 18, 20 or 22 mm.

Strap, quick release or system?

Most watches use spring bars, so any strap of the right width fits. Many smartwatches use their own band system instead, such as Apple Watch bands or Garmin QuickFit.