Strap for Portofino Automatic Stainless Steel / Black - Pilot / Strap

The lug width of the IWC Portofino IW3513-12 is precisely 18 millimetres. This measurement, also referred to as ansa width, defines the distance between the two lugs and determines compatibility with aftermarket straps. To verify the measurement accurately, position a digital calliper perpendicular to the internal surface of the lug, obtaining the exact distance between the contact points on the case.

Alligator leather represents the most coherent choice for the Portofino IW3513-12, as its natural texture and uniform grain interact harmoniously with the case's classical proportions. Nappa calf with patinated finish offers a versatile alternative, whilst shell cordovan satisfies those seeking specialised materials with tactile evolution over time. For daily contexts, natural rubber or technical fabric straps permit consistent wear without compromise.

Strap replacement on the Portofino IW3513-12 requires a spring bar tool (a specialised instrument for removing elastic pins). Position the watch on a soft surface to prevent scratching, locate the small holes at the lug extremities, gently insert the spring bar tool to release the elastic pin, and remove the strap. Before installing a new strap, ensure the spring bars are intact and insert the new strap with uniform movements, verifying that the elastic pins lock correctly into their seats.

All straps with an 18mm lug width are physically compatible with the Portofino IW3513-12. However, aesthetic pairing is fundamental: premium leathers such as alligator, nappa calf, and shell cordovan maintain the watch's constructive dignity, whilst satin finishes and neutral colours (cognac brown, black, navy blue) respect the classical visual identity of the Portofino collection.

Leather strap longevity depends upon material quality, frequency of use, and maintenance. An alligator or shell cordovan strap, subject to normal wear and proper care (dried after humidity exposure, protected from direct sunlight), may endure 5-7 years. Nappa calf evolves more rapidly, developing characteristic patina within 2-3 years. Accelerated leather ageing represents part of the intrinsic beauty: each strap narrates elapsed time, transforming into an increasingly personal and unique object.