Strap for Pilot's Watch Chronograph Stainless Steel / Black / Strap

The lug width of the IWC Pilot IW3717-01 is 21 millimetres. This width is fixed on both sides of the 42mm case and represents the space between the pins that connect the strap to the case. To verify it, measure the distance between the two attachment holes on the case with a calliper or measuring tape.

The ideal strap depends on your use. For formal elegance with sporty character, choose dark brown alligator or vegetable-tanned calf leather; these materials develop a natural patina and amplify the austerity of the design. For daily practicality and ease of change, a dark blue or grey NATO reflects the Pilot's military heritage. If you seek low maintenance, modern FKM rubber offers tactical grip without compromise.

Strap changing requires no specialised tools if you use a model with a deployant clasp (snap closure). For traditional straps with pins, you need a simple spring bar tool: insert the tip into the lateral groove of the pin, gently lift the strap from the case, and extract the pin. Repeat on the other side, then install the new strap by aligning the holes with the pins.

Yes. Any strap with a 21mm lug width is compatible with the IW3717-01. Online you'll find bespoke straps in various leathers (alligator, shell cordovan, vegetable-tanned calf), fabrics and rubbers. Milanostraps offers a selection of ready-to-ship 21mm straps, or Casati Milano creates custom straps by personally selecting the material and construction details.

Durability varies depending on the material and use. A high-quality artisanal alligator or vegetable-tanned calf strap lasts 3 to 5 years with daily wear, ageing with visible patina. Shell cordovan, being denser, can reach 7 to 10 years. Exposure to moisture, sweat and direct sunlight shortens the lifespan; protecting the strap from water and storing it in a dry environment extends durability. Casati Milano guarantees its straps for 18 months.