Strap for Portofino Automatic Stainless Steel / Black

The lug width of the IWC Portofino IW3565-02 is precisely 20mm. This measurement represents the distance between the two lugs protruding from the case. Accurate measurement is essential: you must measure the space between the lugs, not the case diameter (40mm). A 20mm strap inserts perfectly into these spaces, ensuring proper fit without play or friction.

For the IW3565-02, alligator leather in vegetable tanning represents the highest level of sophistication: regular grain, amber patina development over time, and absence of artificial treatments align perfectly with IWC's constructive philosophy. Alternatively, museum-grade shell cordovan offers superior density and longevity. For daily wear, French Gueux calf or a NATO strap in navy wool repp maintains formal wearability without compromise.

Strap replacement requires a spring bar tool and a stable work surface. Insert the tool into the small hole at the base of the connecting lug and apply gentle pressure to extract the spring bar. Remove the old strap and insert the new one by aligning the strap holes with the case lugs. Reinsert the spring bar until you hear the click of secure anchorage. If you prefer to avoid the risk of scratches, the Casati Milano atelier offers professional strap change service by appointment.

Yes, any 20mm strap is mechanically compatible with the IW3565-02. Choosing an artisanal strap of quality (alligator, cordovan, vegetable-tanned calf) is not only compatible but frequently surpasses original IWC options in terms of aesthetics and longevity. The key requirement is respecting the 20mm lug width and verifying thickness to avoid case interference.

Lifespan depends on material, intensity of use, and maintenance. Vegetable-tanned alligator typically lasts 4–6 years with daily use, with the aesthetic advantage of improving patina over time. Shell cordovan resists 6–8 years due to natural leather density. Calf Gueux lasts 3–5 years. All these materials benefit from periodic cleaning with soft cloth and rotation with alternative straps to distribute stress. Casati Milano's 18-month warranty covers manufacturing defects and ensures technical assistance for extended longevity.