Strap for Portofino Automatic 37 Stainless Steel - Diamond / Blue

The lug width (ansa measurement) of the IWC Portofino IW6586-02 is 18 millimetres. This dimension is the European standard for mid-size watches and ensures compatibility with a broad spectrum of artisan straps. You can verify this by inserting a ruler into the space between the two lug attachments on the case.

For the 37mm Portofino, we recommend alligator or vegetable-tanned calf leather for a dressware approach, or shell cordovan for daily versatility. In summer months, a thin NATO strap remains the most breathable choice. The selection depends on your intended use: formal, hybrid, or outdoor.

The strap is changed using a specialised tool (springbar tool) to gently compress the springs at the ansa ends. Atelier Casati Milano provides strap-change service with personalised consultation and workmanship guarantee.

Yes, all 18mm straps available on milanostraps.it are compatible with your Portofino IW6586-02. Our straps are manufactured with standard lugs and precision-tested. You can personalise dimensions, initials, and stitching thread colour according to your preferences.

A quality artisan leather strap typically lasts 3–5 years of daily wear, varying by tanning method and climate conditions. Vegetable-tanned leather tends to patina elegantly with age, whilst alligator and shell cordovan maintain structure longer. Atelier Casati Milano provides an 18-month guarantee on workmanship.