Strap for Portofino Automatic Stainless Steel / Black - Breguet / Strap

The IWC Portofino IW3513-25 features an 18-millimetre lug width. This measurement represents the distance between the two lugs where the strap attaches. It is a rare size in contemporary watchmaking, a deliberate choice to preserve vintage proportions on this 34mm case.

Alligator leather represents the optimal choice for the Portofino IW3513-25. Its geometric texture and structured grain engage perfectly with the minimalist order of the dial. Alternatively, vegetable-tanned calf offers a honey patina that evolves over time, or shell cordovan for those seeking an almost mirror-like lustre. Selection depends on use context and personal colour preferences.

Strap replacement requires precision. Proceed as follows: position the watch on a soft cloth with the case facing downward; use a rounded-point tool (avoid generic screwdrivers) to gently push the spring bar from one side to the other; completely remove the bar and detach the old strap. Insert the new strap by aligning the holes, then reinsert the bar from outside inward. For a professional operation, contact an authorised service centre.

Yes, aftermarket straps compatible with 18mm lug width are available from specialist suppliers such as milanostraps.it. When purchasing an aftermarket strap for the Portofino IW3513-25, always verify that the strap is cut to length to fit correctly to your wrist, considering case width. Custom-made straps also permit personalisation with initials and stitching thread selection.

Leather strap longevity depends on three factors: leather quality, frequency of use, and maintenance care. Quality alligator or shell cordovan offers 3-5 years of daily wear, whilst aniline calf has an average lifespan of 2-3 years under continuous use. Exposure to moisture, direct heat, and perspiration accelerates ageing. With attentive care—drying after exposure, cool environment storage—you can significantly extend strap life.