Strap for Big Crown ProPilot Big Day Date 40th Squadron

The Oris ProPilot 01 752 7698 4274-Set TS features a lug width of 22 millimetres. This measurement represents the internal distance between the two lugs of the case and determines the total width of any compatible watch strap. You can verify this by measuring the space perpendicularly with a rigid ruler, from lug to lug internally, or by consulting Oris's official technical specifications.

For a 45-millimetre case with aviation-focused heritage like the ProPilot, an alligator leather strap represents the ideal choice owing to its coarse grain, natural elasticity, and the patina that develops over years of wear. Alternatively, vegetable-tanned calf leather offers a more refined aesthetic, whilst NATO straps in technical fabric emphasise the military soul of the instrument. FKM rubber is the preferred solution for underwater and operative use.

Strap replacement is accomplished by removing the spring bars that unite the case lugs. Using a dedicated spring bar tool, compress the small internal spring of the pin, extract it gently from the case, and disengage the previous strap. Insert the new 22-millimetre strap, align the spring bar between the two lug ends, and click it back into position. If unfamiliar with this procedure, consult a professional watchmaker to ensure precision and prevent case damage.

Yes, it is entirely possible to fit a 22-millimetre aftermarket strap to the Oris ProPilot 01 752 7698 4274-Set TS. Milano Straps offers a specialised collection of artisanal straps compatible with this lug width, crafted in noble materials including alligator, vegetable-tanned calf, NATO, and technical rubber. Compatibility is guaranteed, as is construction quality and design proportioning to the 45-millimetre case diameter.

The lifespan of a leather strap depends on intensity of use, material type, and care applied. An alligator strap with vegetable tanning, worn daily, retains functionality and aesthetic appeal for 3 to 5 years. The patina developing naturally over time is integral to the charm of vegetable-tanned leather. A Tuscan calf strap may last 2 to 4 years. To extend longevity, we recommend rotating straps during the week, avoiding prolonged direct sunlight exposure, and treating leather with specialised maintenance products once or twice annually.