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

The Portofino IW3513-14 is fitted with 18 mm lug width. This measurement is specific to IWC's 34 mm dress watches and is compatible exclusively with 18 mm straps. To measure the lug width, measure the distance between the inner curves of both lugs; if the value is 18 mm, the strap will insert correctly into the lug holes without play.

Alligator is the ideal material, as its natural texture complements the understated elegance of the stainless steel case. For a patina that evolves over time, vegetable-tanned calf leather is excellent, developing a caramel tone with wear. Hermès calf or aniline leather offer superior softness. NATO is not recommended as the primary choice, as this is a dress watch deserving surfaces that reflect light in a controlled manner.

Strap replacement requires a dedicated spring bar removal tool. Position the flat end of the tool in the release groove of the spring bar, pushing downward to compress the spring. Simultaneously, extract the old strap from one side. Align the new strap's hole with the spring bar, position the spring bar into the new strap's lug slot, and release the spring. Perform the operation carefully to avoid scratching the case.

No. Although other IWC models feature 18 mm lug width, each watch has specific lug geometry and tolerance specifications. A generic 18 mm strap will fit physically but does not guarantee the same centring precision and strap-slot fit. It is advisable to use straps specifically calibrated for the Portofino IW3513-14 or verify compatibility with the seller.

Durability depends on material and wear patterns. High-quality alligator or vegetable-tanned calf leather, worn daily, maintains structural integrity for 4–6 years. Factors such as humidity, prolonged sun exposure, and frequency of wear influence longevity. A NATO strap in cotton lasts 2–3 years. The Casati Milano artisanal warranty covers manufacturing defects for 18 months; replacement due to natural wear is the owner's responsibility.