Strap for Portofino Automatic Yellow Gold / White / Strap

The lug width of the IWC Portofino IW3513-01 is precisely 18mm. This measurement is specific to this model and determines which strap thickness is compatible. An 18mm strap will fit the case lugs with exact precision, ensuring proper fit without excessive play. Do not use straps of different sizes, as they will compromise both the aesthetics and functionality of the watch.

For the Portofino in yellow gold, the ideal strap is genuine alligator (river grade), which combines sober elegance with the warmth of the gold. Shell cordovan is a more formal solution, with a natural lustre that amplifies the luminosity of the case. Vegetable-tanned calf offers versatility and ages magnificently. Avoid stainless steel or thick rubber straps, as these would contradict the delicate proportions of the model. The buckle or deployante should be in yellow gold or fully integrated to maintain aesthetic coherence.

To change the strap, use a spring bar tool (thin lever extractor) to gently remove the elastic pins (spring bars) that hold the strap to the lugs. Work one side at a time, lifting the case slightly with your other hand to avoid scratches. Once the old spring bars are removed, align the new strap holes with the lugs and reposition the elastic pins. If the strap is rigid leather, allow it to relax at room temperature for 24 hours before wear. For the first time, consult a professional watchmaker to avoid damage to the gold case.

Yes, an aftermarket 18mm strap is fully compatible with the Portofino IW3513-01, provided it meets the quality standards the model deserves. A bespoke strap in alligator, calf or shell cordovan from a reputable maker can actually enhance the user experience and personalisation. Ensure the strap has removable spring bars and that the buckle or deployante matches the colour and finish of the yellow gold case. A custom-made strap also allows adjustment of total length to suit your wrist anatomy.

The lifespan of a leather strap depends on tanning quality and usage. Genuine alligator with vegetable tanning can last 4–6 years of daily use before showing significant wear. Shell cordovan is more durable and can exceed 7 years. Vegetable-tanned calf has a lifespan similar to alligator. Factors that shorten lifespan: direct sunlight exposure, salt water, extreme temperatures, lack of maintenance. To extend strap life, dry it after humidity exposure, apply leather conditioner every 6–8 months, and rotate use with other straps if possible. Buckle holes also enlarge over time: a specialist workshop can add extra holes to extend useful life.