Strap for Big Crown ProPilot GMT Rega Fleet Bombardier Challenger 650 - HB-JWA

The lug width of this Oris ProPilot model is precisely 20 mm. This specification, measured from the centre of one lug to the centre of the other, ensures compatibility with 20 mm strap widths. To verify the measurement, use a digital calliper and position it perpendicular between the lugs, measuring from the inside of the first lug to the inside of the second. A tolerance of ±0.5 mm is acceptable without compromising strap installation.

Strap selection depends on intended use. For formal applications, we recommend alligator in neutral tones (grey, cognac brown) with a satin deployante clasp, which emphasises traditional aviator aesthetics. For daily wear, vegetable-tanned leather offers durability and develops a noble patina over time. For technical environments and operational flying, a NATO strap in grey or black Cordura provides water resistance and rapid change capability. Fluoroelastomer rubber remains ideal for tropical climates where humidity compromises leather.

Strap changing requires a dedicated tool: the spring bar tool. Position the watch on a stable surface with the lugs facing upward. Insert the fine tip of the spring bar tool beneath the spring lug from the inner side, pressing gently towards the watch case centre until the spring releases the pin. The old strap then slides away easily. Repeat on the other lug. To fit the new 20 mm strap, align the strap holes with the pins, insert the pin carefully, and push the spring ends into the side grooves until they click into place. Verify that the strap is symmetrical and the pin does not vibrate.

Yes, bespoke aftermarket straps often surpass original factory straps in finish quality and personalisation. For compatibility, they must strictly respect the 20 mm lug width specification. Specialised suppliers in French leather, African alligator, and woven NATO offer hand-stitched constructions, edge-painted finishes, and temperate-hardened steel deployantes rivalling original pieces. Quality depends upon raw material: alligator with visible dorsal spine, vegetable-tanned calf, and original Cordura guarantee extended durability and positive aesthetic ageing.

The lifespan of a leather strap for the Oris ProPilot 01 798 7773 4284 HB-JWA-Set varies depending on material and usage conditions. Quality artisanal calf leather, vegetable-tanned, withstands 2–3 years of daily wear before requiring clasp or deployante replacement. Alligator and heavyweight taurined leather extend durability to 3–4 years. Humidity, perspiration and solar exposure accelerate ageing; conversely, periodic maintenance with natural balms and storage in dry environments significantly extend operational life. NATO and rubber require no maintenance and exceed 5–7 years without aesthetic degradation.