Strap for Portofino Automatic Yellow Gold / Black - Pilot / Strap

The lug width of the IWC Portofino IW3513-03 is precisely 18 millimetres. This measurement represents the internal distance between the case lugs. It is advisable to verify personally using a digital calliper, positioning the tool on the inner shoulders of the lugs, to ensure accuracy within ±0.5mm, especially on vintage examples where wear may have slightly altered original tolerances.

For a yellow gold 18-carat Portofino, alligator leather in cognac or light brown tones represents the traditional aesthetic choice, as its structured grain mirrors the dial's cleanliness without competing chromatically with the metal. Shell cordovan in burgundy or deep plum offers a more contemporary alternative, with an evolving patina over time. Vegetable-tanned calf provides daily versatility. Absolute black is discouraged, as it creates excessive contrast with the watch's warm gold tone.

Position the watch with the case facing downward on a soft surface. Use a spring bar tool (forked implement) to compress the elastic pin from the upper lug area, creating space to extract the pin. Once removed, the original strap detaches easily. Inserting the new strap requires aligning the holes and reinserting the elastic pin from above, ensuring both ends remain seated. Verify that the closure (buckle, deployante or strap) is symmetrical relative to the case.

Yes, all straps engineered for 18mm lug width are compatible with the IW3513-03, regardless of manufacturer. However, it is essential to verify that the strap's total width does not exceed the case shoulder. For yellow gold, artigianal straps with a matching leather loop and coordinated colour finish are recommended to avoid visual discontinuity. Stitching quality and edge finishing significantly influence the watch's perceived value.

A quality leather strap (alligator, shell cordovan or vegetable-tanned leather) worn daily on a 34mm Portofino typically lasts 3–5 years, with variability depending on climate, frequency of use and care. Alligator tends to retain elasticity longer; shell cordovan, whilst evolving aesthetically, remains functional beyond five years. Primary wear concentrates around the buckle and loop area. Proper storage—drying after moisture exposure, protection from direct sunlight—significantly extends longevity.