Strap for Portofino Chronograph MecaQuartz Stainless Steel / Black

The lug width of the IWC Portofino IW3724-04 is 20 millimetres. This dimension is the international standard for classical timepieces in the 36-38 millimetre category and ensures visual balance between the case and the wrist without aesthetic compromise.

The best strap depends on intended use: alligator is the most refined choice for formal occasions, vegetable-tanned calf offers daily versatility with a patina that evolves over time, whilst shell cordovan provides compactness and natural luminosity. For sporting applications, cotton or silk NATO straps deliver chromatic versatility without mechanical compromise.

Strap replacement requires a specific tool (spring bar tool). Insert the tool gently into the lateral slots of the lug, compress the internal spring and slide the lug outward. Repeat for both ends, then insert the new lugs by pressing until the spring clicks into place. If uncertain, consult an authorised service centre.

Yes, it is possible to use aftermarket straps provided the lug width is 20 millimetres. Artisanal custom straps, such as those crafted by Casati Milano, guarantee not only mechanical compatibility but also aesthetic coherence with the classical DNA of the model, with personalisation in leather, sizing and stitching details.

The lifespan of a leather strap depends on construction quality and frequency of use. A high-quality alligator or shell cordovan strap, worn daily, guarantees 3-5 years before replacement is necessary. Vegetable-tanned calf offers similar longevity but visible patina accelerates the perception of ageing. Artisanally crafted straps often include 18-month warranty against manufacturing defects.