IWC
Pilot IW3255-02 (aka: 3255-02, IW325502)— lug 20mm

The lug width of the IWC Pilot IW3255-02 is 20 mm. This measurement is taken from the inner shoulder of one lug to the opposite lug. It is a specific dimension requiring custom-made watch straps, as mainstream aftermarket offerings concentrate on 18 mm or 22 mm widths. The external width of the original metal lugs is approximately 22 mm, creating the distinctive visual proportion characteristic of the Pilot family.

Alligator leather represents the absolute luxury choice for the IW3255-02, as its natural texture contrasts magnificently with the cold geometry of the satin-finished steel case. Equally refined, Japanese shell cordovan (Horween or Shinki) develops a unique patina over time and offers superior durability compared to common calf leathers. Vegetable-tanned calf guarantees natural chromatic richness and daily versatility. For pure technical use, hi-density nylon NATO straps remain faithful to the Pilot's aviation heritage. FKM rubber is the option for humid climates or frequent nautical applications.

Strap replacement on the IW3255-02 is accomplished via small pins (spring bars) connecting the strap to the case lugs. A specific tool (spring bar tool) is required to push the pin laterally and release the strap from the lug. This operation should be performed on a soft surface (cloth) to prevent accidental scratches. If inexperienced, it is advisable to entrust the task to an expert: the Casati Milano atelier offers this service by appointment, guaranteeing precision and case protection.

Yes, any aftermarket strap manufactured with a 20 mm lug width is compatible with the IW3255-02. It is essential to verify that the internal width is exactly 20 mm—not 20.5 mm or 19.5 mm—to ensure precise and stable installation. Milano Straps manufactures custom straps for this width in selected materials (alligator, shell cordovan, calf, NATO, rubber) and offers personalisation of initials, length measurements, and stitching colours.

The lifespan of a leather strap depends on tanning quality and intensity of use. Premium alligator or shell cordovan resists 4–6 years with moderate daily wear, developing a natural patina that enhances aesthetic character. Vegetable-tanned calf typically lasts 3–4 years before structural deterioration becomes apparent. FKM rubber is more durable (5–8 years) but gradually loses elasticity. The Casati Milano atelier provides an 18-month warranty on all straps and offers restoration services (re-stitching, passant replacement, clasp upgrade) at contained costs.