Strap for Big Crown ProPilot Worldtimer Stainless Steel / Grey / Bracelet

The lug width of the ProPilot is 22 mm. This measurement refers to the internal distance between the two lug shoulders, measured perpendicular to the case plane. It is a characteristic width of Oris aviator instruments, superior to the common 20 mm standard found in sport models.

The ideal material depends on intended use. For formal elegance, vegetable-tanned calf or alligator offer lasting patina. For tactical practicality, NATO fabric ensures ease of changing and durability. For humid or marine environments, FKM rubber is recommended. The ProPilot, given its aviator heritage, maintains aesthetic dignity with all these materials.

Strap replacement requires removal of the lug pins (spring bars). Position the watch on a soft surface, use a dedicated tool (spring bar removal tool) to compress the spring mechanism inside the pin, and slide the pin out of the lug shoulder. Insert the new strap with the ends into the hole, then reassemble the pins until you hear the closure click.

Any strap with a 22 mm lug width is compatible, provided that manufacturing tolerances are below 0.3 mm to prevent lateral play. Always verify before ordering that the strap ends are dimensioned for a 22 mm lug. The artisanal straps from milanostraps.it are specifically manufactured for this measurement.

A vegetable-tanned calf strap typically lasts 4-6 years with daily use and proper maintenance (monthly cleaning, drying after humidity exposure). Alligator, thanks to natural tannins and scale texture, has greater longevity (6-10 years). Climate, usage frequency, and type of perspiration significantly influence durability. A NATO fabric strap easily exceeds 10 years.