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

The lug width is 20 millimetres, measured internally from wall to wall of the case. This measurement is critical for strap compatibility: only straps manufactured for 20mm lugs will fit correctly without play or strain. Always verify with callipers before ordering.

Alligator leather in dark brown or black is the primary choice: uniform grain and natural flexibility emphasise the watch's instrumental character. Alternatively, vegetable-tanned calf offers structured texture. For sporting purposes, nitrile rubber is reliable and ages with dignity. Cotton NATO straps are valid for those seeking reduced mass perception.

The ProPilot uses standard spring bars. Obtain a spring bar tool, insert the tip under the bar on the opposite side from the anchoring point, apply gentle pressure to compress the internal spring, extract the bar and replace it with a new one fitted to the incoming strap. Do not force: the mechanics are delicate. If uncertain, consult a specialised atelier.

Yes, provided the lug width is certified at 20 millimetres. Oris uses universal spring bar standards, so any strap correctly manufactured for 20mm lugs—from specialist craftspeople like Casati Milano—will fit mechanically. Always verify technical specifications before purchase.

A quality artisanal alligator or calf strap, worn daily under normal ambient humidity, maintains structural integrity for 3–5 years before significant fibre deterioration appears. Longevity depends on climate, cleaning frequency and rotation with other straps. The emerging patina is acquired character, not decay. Preventive maintenance—conditioning with natural moisturiser every 6–12 months—significantly extends functional life.