Strap for Big Crown ProPilot GMT Rega Fleet AgustaWestland Da Vinci - HB-ZRS

The lug width of the Oris ProPilot 01 798 7773 4284 HB-ZRS-Set is 20 mm. This measurement refers to the internal distance between the two lug holders on the case. The lug cavity depth is approximately 2.5 mm, a tolerance that accommodates straps with thickness between 2.8 and 3.2 mm without excessive play.

The optimal strap depends on intended use. For instrumental elegance: vegetable-tanned alligator in dark brown or cognac calf. For resilience: black FKM rubber. For daily versatility: European vegetable-tanned calf. For critical environments (high humidity, thermal fluctuations): nylon Cordura NATO in black. All are available in 20 mm lug width at our archives.

Strap replacement on the ProPilot requires two tools: a spring bar tool and a flat work surface. Position the watch face-down, insert the flat tip of the tool into the small lateral notch of the lug, gently lift the internal spring bar, remove the worn strap, align the new strap holes, and press until the spring bar clicks. Time required: 2 minutes per side.

Yes. Any strap with a 20 mm lug width is physically compatible. Material choice and thickness (2.8–3.2 mm) determine fit quality. Bespoke leather straps offer superior aesthetic adaptation compared to mass-produced alternatives, ensuring balanced proportions between case and strap.

A vegetable-tanned leather strap of quality, with regular maintenance (annual conditioning with dedicated balm), lasts 5–8 years under daily-use conditions. Longevity increases if the strap is rotated weekly with an FKM rubber or NATO alternative. Critical factors: ambient humidity, frequency of water exposure, direct solar exposure. In dry climates and with moderate use, patina reaches superior aesthetic levels after 3–4 years.