Strap for Portofino Lady Chronograph MecaQuartz Stainless Steel / Yellow Gold / Black / Alligator

The lug width of the IWC Portofino IW3730-15 is precisely 16mm. This is the distance between the two spring bars that connect the case to the strap. It can be verified with a digital calliper positioned between the inner lugs of the case. A 16mm strap is the only compatible option for this model.

Alligator leather with vegetable tanning is the most coherent material choice for the Portofino IW3730-15's aesthetic and construction. The reptile's natural texture creates visual movement and develops a rich patina over time, harmonising perfectly with the watch's bimetallic case (yellow gold and stainless steel). Medium-grain calf leather is a valid alternative, while semi-gloss shell cordovan in black adds tonal depth.

Removing the Portofino strap requires a very fine cross-head screwdriver and a spring bar tool. Locate the two spring bars at the case ends, gently insert the screwdriver under the bar's flat end to release the spring, then withdraw the strap. When positioning the new 16mm strap, ensure the bars engage securely in the case lugs. If you prefer to avoid this task, our artisans in Milan can perform the swap in the atelier with full assembly warranty.

Yes, any strap with a 16mm lug width is compatible with the Portofino IW3730-15, provided the spring bars have the same diameter and the strap has been constructed to specification. We always recommend verifying that the strap's terminal is straight and that the stitching is robust (12-14 stitches per cm in waxed thread). A bespoke artisan strap guarantees absolute conformity to your anatomical and stylistic requirements.

Durability depends on usage and leather quality. A vegetable-tanned alligator or calf strap lasts 3-5 years with daily wear; if rotated with other straps, even 7-10 years. Shell cordovan is considerably more durable. The natural deterioration of leather is part of the appeal: the strap acquires patina and character over time. Proper maintenance—minimal moisture exposure, gentle cleaning, occasional conditioning—significantly extends the strap's lifespan.