IWC
Pilot IW3711-24 (aka: IW371124)— lug 21mm

The lug width is precisely 21 millimetres. This is not a standard commercial size like 20mm or 22mm, but rather specifically calibrated to the proportion between case diameter (42mm) and the geometry of solid, drainless lugs. Measurement is performed with a digital calliper inserted between the two lugs to guarantee millimetre precision.

For platinum, we recommend American alligator with medium grain and aged patina, which creates tactile dialogue with the precious metal whilst emphasising the watch's instrumental nature. Burgundy shell cordovan represents the alternative for those seeking radical aesthetic change with personal affection over time. For daily wear, vegetable-tanned calf offers superior structural robustness, whilst nylon NATO in tactical colours remains ideal for emphasising the original chronograph function.

The change requires a spring bar extractor tool: insert the tip into the small notch on the spring bar, lift outward until you feel the release click, extract the spring bar and repeat on the other side. Carefully remove the old strap and insert the new one by aligning the holes with the lugs. Ensure the spring bar is fully seated in the lugs before wearing the watch. If you prefer to avoid manipulation, Casati Milano offers replacement service with in-person consultation.

Absolutely. Any artisanal quality aftermarket strap with 21mm lug width is compatible with the IW3711-24. Compatibility is guaranteed by spring bar geometry: the important factor is that the strap be constructed to rigorous standards (uncut tips, double stitching, quality finishing). Milanostraps.it straps meet these parameters and include technical consultation to verify fit and aesthetic proportions.

A quality alligator or shell cordovan strap with daily wear maintains structural integrity for 4-6 years. Vegetable-tanned calf lasts 2-4 years depending on frequency of use and humidity exposure. Surface patination is natural and adds character; breakage occurs when fibres no longer support case weight (42mm platinum is substantial). Casati Milano offers regeneration and restoration service to extend the life of your personal strap.