Strap for Pilot's Watch Doppelchronograph Stainless Steel / Black / English / Strap

The lug width of the IWC Pilot IW3713-03 is 21 millimetres. This measurement represents the distance between the two horizontal pins that protrude from the case and into which the strap's spring bars are inserted. It is essential to use a strap exactly 21mm wide to avoid structural tension on the case lugs. A 20mm or 22mm strap would result in visual misalignment and potential failure of the junction points between strap and case.

Alligator leather with vertical grain represents the optimal choice for the IW3713-03, as the natural texture resonates visually with the tool-watch aesthetic and stainless steel case. Alternatively, vegetable-tanned calf offers anatomical softness and a natural patina that refines over time. For robust aeronautical applications (vintage aircraft, chemical environments), vulcanised rubber or 6.6 nylon NATO straps provide absolute waterproofing and chemical resistance. Avoid saturated colours that fragment the visual harmony of the watch.

Strap replacement requires a spring bar tool (a specialised two-pronged instrument) to compress the internal springs of the pins. Position the watch on a soft surface (cotton cloth) to prevent scratches. Insert the spring bar tool on one side, compress the spring until the pin releases, remove the old strap. Repeat on the other side. Position the new strap's pins into the case lugs and press until you hear a click of closure. If you are not experienced, Casati Milano offers strap changing by appointment.

Yes, provided the strap is specifically dimensioned at 21mm lug width. Quality artisanal aftermarket straps (such as those from MilanoStraps) are completely compatible and allow you to personalise the watch according to your style. Always verify exact measurements before purchase. The quality of construction (stitching, lug finishes, tanning type) will make the difference in longevity and wearing comfort.

Longevity depends on the tanning method and intensity of use. A vegetable-tanned alligator strap, with regular maintenance (monthly cleaning, bimonthly conditioning with specialist creams), has an average lifespan of 5-7 years under normal daily-wear conditions. Vegetable-tanned calf, being softer, lasts approximately 3-4 years. Vulcanised rubber or NATO straps have greater longevity (8-10 years) due to material resistance. Casati Milano guarantees 18 months on construction and stitching; natural leather wear is not covered by warranty but is a sign of authentic watch history.