Strap for Big Pilot's Watch Big Date Stainless Steel / Blue / Zürich

The IWC Big Pilot IW5105-05 features a 22-millimetre lug width. This dimension is specific to this model and allows you to select straps specifically engineered to fit the 46.20mm case perfectly. Lug width is measured by positioning a digital calliper between the two internal pins that anchor the strap to the case.

For the Big Pilot IWC, alligator with characteristic vertical grain is the classic choice: it offers formal elegance, dries rapidly, and develops a fascinating patina over time. Vegetable-tanned calf is a sustainable and versatile alternative. NATO in heavy canvas recalls aviation military equipment, whilst vulcanised rubber guarantees resistance to hydrocarbons and extreme temperatures. The choice depends on your lifestyle and intended use.

Changing the strap requires a specific tool—the spring bar tool—to remove the elastic pins (spring bars) that secure the strap to the case. Position the tool beneath the pin, apply gentle pressure to compress the internal spring, and extract the pin. Repeat for both sides. Insert the new strap by positioning the pins in the corresponding holes and pressing until the attachment clicks into place. If you are unsure of the procedure, Casati Milano's strap change service offers professional assistance.

Any strap with a 22-millimetre lug width is compatible with the Big Pilot IW5105-05. Milanostraps offers a selection of artisanal straps in 22mm size, crafted from alligator, calf, cordura, and rubber, customisable in lengths, initials, and stitching colours. All straps are pre-tested to guarantee both physical and aesthetic compatibility with the IWC model.

A high-quality leather strap (alligator or vegetable-tanned calf) under proper use typically lasts 4–6 years in daily wear conditions. Longevity depends on frequency of wear, moisture exposure, care, and maintenance. Milanostraps straps include an 18-month warranty against manufacturing defects. Periodic strap replacement is recommended to maintain the watch's aesthetic and ensure lug security.