Strap for Pilot's Watch Chronograph Ceramic / Italian / Strap

The lug width of the IWC Pilot IW3705-02 is 20 millimetres. This measurement refers to the distance between the attachment pins (lugs) on the watch case. To verify aftermarket strap compatibility, physically measure the internal distance between the two lugs—it must correspond exactly to 20 millimetres. This measurement is critical to ensure a proper fit without excessive play or tightness.

For the IW3705-02, we recommend premium leather straps: black or dark brown alligator for formal aesthetics and proven longevity; shell cordovan for evolving patina and smooth surface; vegetable-tanned calf for breathability and visible wear over time. Alternatively, technical straps in Cordura or FKM rubber preserve the original instrumental aesthetic, ideal for informal or flight contexts.

Strap replacement requires a spring bar tool (or pin removal bar). Place the watch on a soft surface to protect the case. Insert the thin end of the tool into the small hole at the base of the lug, applying gentle pressure to release the locking pin. Repeat on the opposite side. Once the pins are removed, extract the old strap and insert the new one, realigning the pins. If inexperienced, consult a professional: Casati Milano provides this service with warranty coverage.

Yes, aftermarket straps compatible with the 20-millimetre lug width can be used. However, compatibility also depends on strap depth (the height of the passants relative to the lugs). Before purchasing, verify the strap has been tested on Pilot IWC models of the same generation. On milanostraps.it, you will find a curated selection of 20mm straps already verified for compatibility, as well as bespoke commission options through Casati Milano.

A premium leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts 3–5 years with daily wear, provided regular maintenance: drying after humidity exposure, avoiding chemical solvents, occasionally applying specialist balms. Lifespan extends to 7–10 years with moderate use (2–3 times weekly). Technical straps in Cordura or FKM rubber achieve superior durability (5–10 years), resisting moisture and atmospheric agents better. Casati Milano guarantees 18 months on bespoke straps, covering manufacturing defects.