Strap for Portuguese Chrono-Automatic White Gold / 266 Diamond

The IWC Portugieser IW3714-75 features a 20 mm lug width. This measurement is taken between the two inner holes of the spring bar without compression. It is the standard dimension for watches with approximately 40 mm diameter cases.

For this white gold chronograph, we recommend genuine alligator in dark brown with tight grain, or shell cordovan in mahogany tone. Both materials develop a natural patina that complements the ageing of white gold. If you prefer versatility, vegetable-tanned calf in anthracite grey or sand maintains formality without the maintenance demands of exotic leathers.

Use a spring bar tool sized for 20 mm lugs. Insert the fine tip into the spring bar hole and gently lift the lug to release the bar from its seat. Repeat on the opposite side. When fitting the new strap, ensure the bar is horizontally aligned and that both ends click into position with an audible snap.

Yes, any strap with a 20 mm lug width is compatible with this model. High-quality bespoke straps—crafted from alligator, shell cordovan, vegetable-tanned calf, or FKM rubber—do not compromise functionality. Verify that the leather thickness (typically 1.4–1.6 mm) allows natural flexing around the wrist without excessive initial stiffness.

A quality exotic leather strap (alligator, cordovan) lasts 5–8 years with ordinary care: drying after humidity exposure, avoiding temperature swings, periodic cleaning with a damp cloth. Vegetable-tanned calves have similar or greater longevity. Primary wear concentrates on the buckle and the fold zone around the lugs. Casati Milano guarantees bespoke straps for 18 months.