Strap for Portugieser Chrono-Automatic Seddiqi – Al Jalila Foundation Dubai

The lug width of the IWC Portugieser IW3714-89 is 20 mm. This is measured from the outer edge of one lug to the outer edge of the opposite lug, perpendicular to the case. This dimension constrains strap selection, excluding standard sizes like 18 or 22 mm. An aftermarket strap must be precisely 20 mm wide to ensure correct fit without axial movement or excessive tightness.

For this model, we recommend alligator in vegetable tanning (lozenge grain that reflects light like the dial), or shell cordovan for minimalist profile with dramatic ageing. Vegetable-tanned calf offers versatility in colour and moderate maintenance. Choice depends on intended use: formal wear suggests burgundy cordovan; versatile daily wear favours mid-brown alligator; contemporary aesthetic suits military-grade canvas at 20 mm with a deployante clasp.

Remove the strap using a spring bar tool by gently pressing the curved astine to the side, then detaching the strap from one end. Repeat on the opposite side. Insert the new strap by aligning the ends with the lug slots, then engage the spring bars until you hear a click confirming lock. Avoid forcing the fit—it must be precise but not violent.

Yes, any high-quality aftermarket strap with precise 20 mm measurement is compatible. The IWC case features standard lugs with straight slots (not offset), facilitating installation. However, verify strap thickness: if below 2.2 mm, slight movement may occur. Artisanal Casati Milano straps are crafted with reinforced ends to guarantee perfect fit and longevity.

A quality leather strap on a chronograph like the IW3714-89 typically lasts 3–5 years with moderate daily wear. Vegetable-tanned alligator and cordovan resist longer (up to 7–8 years) due to superior fibre density. Calf requires more frequent maintenance but remains aesthetically pleasing for 4–6 years. Natural ageing (patina, minor creasing) is predictable; premature failure indicates poor storage (humidity, direct sunlight) or excessive pressure. Casati Milano straps include 18-month warranty and personalised care guidance.