IWC · Portofino
Strap for Portofino Automatic / Stainless Steel / Silver - Breguet / Strap
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
The Portofino IW3513-19, seen from the bench
Frequently asked questions
What is the lug width of the IWC Portofino IW3513-19?
The lug width is 18mm, a specific measurement rarely available in the standard market. Measure the distance between the two articulation pins on the case to verify compatibility before purchase.
Which strap pairs best with the Portofino IW3513-19?
Natural alligator or shell cordovan are the most coherent choices with the dresswatch identity. Cognac alligator creates harmony with the silver dial, while cordovan develops a golden patina over time. Vegetable-tanned calf remains a versatile and comfortable alternative.
How do I change the strap on my IW3513-19?
Use a spring bar tool to gently push the lateral pins inward toward the case and lift the strap. The procedure requires 5 minutes and a steady hand. If you are unsure, contact Atelier Casati Milano for assistance.
Are aftermarket straps compatible with this IWC?
Yes, provided the lug width is exactly 18mm. Most commercial straps follow the 20mm standard, so verifying compatibility is essential. MilanoStraps offers a complete collection of 18mm straps already tested.
How long does a leather strap last on a watch like the Portofino?
A quality alligator or cordovan strap lasts 3-5 years with daily wear, peaking at 7-8 years if worn occasionally. Vegetable-tanned leather, being softer, tends to weaken after 2-3 years. Wear depends on humidity, sun exposure, and frequency of 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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only