Strap for Big Crown ProPilot Chronograph Stainless Steel / Black

The lug width (ansa measurement) is 22mm. This dimension is the contemporary standard for 44mm watches with the ProPilot's proportional ratio. To verify, measure the internal distance between the lugs with a digital calliper, positioning it perpendicular to the barrel pins.

The choice depends on intended use. Alligator in cognac or dark brown emphasises the avionic heritage and temporal elegance. A NATO Premium in regenerated fibres offers versatility and reversibility, ideal for humid environments and intensive wear. FKM rubber represents the pure technical solution for flight and outdoor contexts. Vegetable-tanned calf leather provides the modern compromise between sustainability and everyday refinement.

Place the watch on a soft surface with the case facing upwards. Locate the barrel pins (the metal axes connecting the case to the lugs). Using a dedicated tool (pin remover), push the pin from one side to eject it from the other, freeing the old strap. Insert the new 22mm strap, then reinsert the pin. Verify that it is properly secured and that the lug rests firmly against the case.

Yes, provided it is compatible with the 22mm lug width. Milano Straps artisanal straps are specifically manufactured for this dimension. Always verify that the lug pins are of correct length (typically between 1.8 and 2.0mm in diameter) to avoid play or unstable fixation. The quality of stitching and buckle (especially if equipped with a deployante clasp) influences overall longevity and comfort.

Durability varies according to tanning method, use and maintenance. Alligator with vegetable tanning, subjected to moderate daily wear, maintains structural integrity for 3–5 years; patina shift and colour change are natural and desirable. Calf leather lasts approximately 2–3 years with regular maintenance (gentle cleaning, protection from impacts). Avoid prolonged exposure to salt water and direct UV rays. Opt for a stainless steel deployante clasp if intensive use is anticipated: it extends strap life and distributes stress more evenly across the lugs.