Strap for Big Pilot’s Watch Annual Calendar Edition Le Petit Prince White Gold

The lug width of the IWC Big Pilot IW5027-05 is 22mm. This measurement represents the distance between the two pins that hold the spring bar assembly inside the case. It is essential to measure this distance precisely before ordering an aftermarket strap, as 22mm ensures complete compatibility without requiring any structural modifications or forced adjustments.

For the Big Pilot IW5027-05 in white gold, we primarily recommend a strap in Nile alligator leather, whose stratified texture enhances the natural patina of the precious case. Alternatively, Italian calf leather with vegetable tanning offers pronounced and irregular grain, remaining faithful to the aviatory spirit. For sportier applications, a vulcanised rubber strap guarantees optimal grip and durability in demanding conditions.

Changing the strap on a case with 22mm lug width requires a specific tool (spring bar remover). Locate the small holes on the case lugs where the elastic pins reside; insert the flat end of the remover into these recesses, apply gentle pressure to decompress the spring bar, then slide the old strap away from the pins. Repeat the operation in reverse with the new strap, ensuring the pins lock completely into their housings.

Any strap with a 22mm lug width is compatible with the IW5027-05, provided it is constructed to robust specifications (leather thickness 1.2–1.5mm, double-stitched nylon or silk seams, hardware in stainless steel or white gold). Milano Straps offers a curated collection of 22mm straps customisable in material (alligator, calf, shell cordovan, rubber) and colour, backed by an 18-month warranty.

The longevity of a leather strap depends on frequency of use, material quality, and maintenance. A high-quality alligator strap with vegetable tanning, worn daily, has an operational lifespan of 3–5 years before requiring replacement due to structural failure. Natural leather inevitably develops patina and wear marks; regularly applying specialised leather balms extends its functional life. For the Big Pilot, considered an aviatory sports watch, a rubber strap offers greater longevity (5–8 years) whilst maintaining elastic integrity.