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

The lug width is 20mm. This non-standard measurement in contemporary watchmaking requires straps specifically engineered for this width. Correct measurement is performed with a calliper positioned at the internal distance between the case lugs. Any strap must respect precisely 20mm to guarantee stable mounting and absence of mechanical play.

The choice depends on operational use. For formal and daily environments, Italian vegetable-tanned calf leather offers natural patina and conscious ageing. For extreme operations and humid environments (airports, maritime), quilted alligator ensures intrinsic water resistance and flexion resilience. For rapid tactical use, NATO Cordura straps or FKM rubber allow quick changes maintaining functionality. Structured shell cordovan is ideal for diving and high-salinity maritime environments.

Strap change requires extraction of the lug pins from the case lugs. Use a dedicated tool (pin pusher) to prevent scratches on the case. Align the new 20mm strap to the lugs, reinsert the lug pins perpendicularly until locking. Verify that the strap is symmetrical relative to the case and exhibits no lateral play. If the strap has a deployante buckle, check that the closing mechanism functions correctly without loosening.

Any strap with 20mm lug width is compatible, provided the lugs accept the standard lug pin diameter (typically 1.8mm on Oris models). Available straps include full-grain leather (calf, alligator, shell cordovan), resilient NATO fabrics, elastics and specialised rubbers. Always verify that the manufacturer specifies 20mm compatibility to avoid mounting errors. Casati Milano atelier personalises artisanal straps bespoke for this reference.

Durability depends on leather quality, frequency of use and environmental conditions. Italian vegetable-tanned calf resists 2-4 years in daily use, developing natural patina that increases aesthetic appeal. Quilted alligator guarantees extended durability (4-6 years) owing to the compact leather structure. FKM rubber lasts 3-5 years before progressive elasticity loss. Accelerated wear depends on constant exposure to moisture, saline perspiration and UV radiation. Periodic maintenance (cleaning, conditioning with light vegetable oils) significantly extends strap lifespan.