Strap for Big Pilot's Watch Perpetual Calendar Toto Wolff x Mercedes-AMG Petronas Formula One Team

The lug width of the IWC Big Pilot IW5036-07 is 22mm. This measurement represents the distance between the two case lugs where the strap anchors via its spring bars. It is a fundamental construction specification that ensures exact compatibility with aftermarket straps and does not allow any variation.

The best strap for the Big Pilot IW5036-07 depends on intended use and personal preference. For an aesthetic faithful to avionic tradition, we recommend alligator in dark brown with a brushed buckle, which naturally complements the Ceratanium case. Shell cordovan offers superior body and a patina that tends toward deep brown, whilst vegetable-tanned Italian leather allows visible ageing of the strap. Technical rubber nitrile straps represent maximum functionality in humid or marine environments.

Changing the strap on the IW5036-07 requires a spring bar tool and a stable work surface. Insert the flat tip of the tool into the vertical hole beneath the lug, gently push downward to compress the spring pin, then extract the strap. Repeat for the other lug. The operation requires caution to avoid scratching the Ceratanium case. For safety, it is advisable to have assistance from an official IWC service centre.

A 22mm aftermarket strap will not damage the Big Pilot IW5036-07 if constructed with adequate quality standards. The critical factor is that the strap's spring bars are stainless steel (not aluminium) and that the strap exerts no anomalous pressure on the lugs. Artisanal straps of quality, made with noble leathers and double stitching, guarantee resistance and durability comparable to original IWC straps.

The lifespan of a leather strap depends on the material chosen and the intensity of use. An alligator or shell cordovan strap, with quality tanning, can last 5–7 years if subject to moderate daily wear. A vegetable-tanned Italian calf strap, thanks to fibre density, easily reaches 4–6 years. Frequency of cleaning, exposure to direct sunlight, and ambient humidity are factors that accelerate or slow ageing. Casati Milano atelier offers an 18-month guarantee on bespoke straps.