Strap for Portofino Automatic Moonphase Stainless Steel / Silver / Alligator

The lug width (or ansa width) of the IWC Portofino IW4594-01 is 20 millimetres. This measurement is critical for aftermarket strap compatibility, as it corresponds to the distance between the two spring bars that fit into the lugs on the case. It is essential to verify this measurement with precision before purchasing a replacement strap.

The most appropriate strap depends on the intended use, but for aesthetic fidelity, alligator in dark tones (brown, blue, black) or shell cordovan in cognac or burgundy is recommended. These materials honour the formal sobriety of the Portofino and its heritage as an elegant timepiece. For more sporting applications, vegetable-tanned calf or technical rubber straps represent contemporary alternatives of exceptional versatility.

Strap replacement requires removal of the two spring bars from the case lugs. Use a dedicated spring bar tool to gently push each bar inward, releasing the end from its aperture. Once the old strap is removed, align the new strap's holes with the bar ends and carefully reinsert the bars until they click into position. Never use improvised tools such as screwdrivers, as these risk damaging the lugs.

Yes, all straps with a 20-millimetre lug width are compatible with the IWC Portofino IW4594-01. However, build quality, stitching and materials can vary significantly between manufacturers. Artisanal straps from specialist workshops guarantee more natural wear development, evolved patina over time, and superior longevity compared to standard industrial alternatives.

The lifespan of a leather strap varies significantly based on material, stitching quality and frequency of use. An alligator or shell cordovan strap crafted by skilled artisans can maintain excellent condition for 5-8 years of daily wear, developing characteristic patina. Vegetable-tanned calf typically lasts 4-6 years but with more natural and evolved aesthetics. Factors including sun exposure, humidity and cleaning frequency significantly influence longevity. Artisanal straps commonly offer an 18-month warranty and permit restoration interventions.