Strap for Portugieser Chronograph Stainless Steel / Silver - Rose

The lug width of the Portugieser IW3716-04 is 20 millimetres. This width is calculated by IWC to maintain proper volumetric proportions with the 41-millimetre case. To verify whether a strap is compatible, measure the internal distance between the two metal lugs at the case extremities: it must correspond exactly to 20 millimetres. Any deviation would result in a forced fitting with risk of structural damage.

The choice depends on your primary use case. For formal elegance, an alligator with vegetable tanning or a shell cordovan are ideal: the former offers regular texture and defined grain, the latter develops dark patina over time. For versatile daily wear, a vegetable-tanned calf leather ensures durability and natural ageing. For sport use, a NATO strap in linen or thick cotton restores the watch's instrumental character. The robust construction of the Portugieser permits seamless transitions between these material registers without compromise.

Strap mounting occurs via the lugs: the strap inserts into the lateral spaces of the case, where it is retained by thin metal pins (spring bars) or screw systems depending on the watch configuration. To remove the previous strap, use a dedicated tool (spring bar tool) to release the outer pin with gentle leverage. To fit the new 20-millimetre strap, align the lateral apertures with the lugs and reinsert the spring bar. If your watch features a deployante clasp, verify that the opening mechanism operates smoothly without jamming. If uncertain, entrust the operation to a professional: precision is required to avoid scratches on the case.

Yes, many specialised manufacturers offer certified aftermarket straps in 20 millimetres. Compatibility depends rigidly on lug width: any strap labelled as 20mm will mount on the Portugieser IW3716-04 without adaptation. MilanoStraps offers an artisanal collection of 20mm straps in alligator, cordovan, calf and rubber, customisable in colours, initials and thread. For maximum quality experience, the Casati Milano atelier also crafts bespoke straps to measure, with direct leather selection and personalised WhatsApp consultation.

Leather strap durability depends on tanning method, use intensity and care. An alligator or cordovan strap with vegetable tanning, worn daily on a watch with a 41-millimetre case like the Portugieser, typically lasts 3–5 years before replacement. This longevity increases if the strap is rotated (not worn every day) and if the leather is regularly protected from excess moisture. Vegetable tanning, whilst more natural and affording fascinating visible ageing, is less resistant than synthetic finishes, yet permits extraordinary aesthetic development. A calf strap offers comparable durability, whilst a NATO in synthetic material may last 7–10 years with continuous use. MilanoStraps offers an 18-month warranty on all straps crafted by the Casati Milano atelier.