Strap for Big Crown ProPilot Chronograph Stainless Steel / Grey

The lug width of the Oris ProPilot 01 774 7699 4063-07 5 22 05FC is 22 mm. This dimension was specifically chosen to properly proportion the 44 mm tonneau case and to ensure secure anchoring, particularly over flight suit fabric. To verify compatibility, measure the internal distance between the attachment pins: it must be precisely 22 mm.

The ideal strap depends on intended use: for formal contexts, an alligator strap with vegetable tanning in matt black or dark brown reflects the visual gravity of the dial. For intensive daily wear, a high-denier silk NATO or vulcanised FKM rubber offers resistance without visual compromise. Milano Straps handcrafted straps in all these solutions are specifically constructed for 22 mm lugs.

To change the strap, remove the watch and position it on a soft surface. Using a dedicated spring bar tool, apply gentle inward pressure to release the attachment pin from one lug. Once the pin is removed, extract the old strap and insert the new one by aligning the lateral holes. Reinsert the pin into the opposite lug using uniform pressure until fully secured.

Yes, provided they respect the 22 mm lug width specification. Quality aftermarket straps—particularly handcrafted examples—offer superior aesthetic and constructive variety compared to original straps. Always verify that the strap is engineered for 22 mm lugs and that the strap width allows at least 1 cm overlap to prevent stress on lugs and pins.

Leather strap longevity depends on usage context and tanning method. An alligator strap with vegetable tanning, worn in formal contexts 2-3 days weekly, lasts 5-7 years before replacement. If worn daily over textured materials or flight suits, lifespan reduces to 2-3 years. Calf leather straps have shorter life (3-4 years in moderate use) due to less dense fibre structure. Milano Straps handcrafted straps are engineered for 22 mm lugs with optimised thicknesses to minimise stress and extend service life.