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

The lug width of the Oris ProPilot 01 798 7773 4284 HB-ZRQ-Set is 20mm. This measurement is critical for strap compatibility: only straps with a 20mm inner passant width will fit without lateral play. Measurement must be taken between the two vertical lugs, at the top of the case where manufacturing tolerances are most rigorous.

Three primary profiles are recommended: alligator leather of superior quality to preserve the instrument character and develop patina over time; military NATO in reinforced cotton for maximum robustness in critical environments (saline, humid); FKM rubber for operators in extreme conditions requiring consistent grip. A vegetable-tanned calf leather strap is the classical alternative and ages elegantly with patina development.

The strap is changed by extracting the spring bars (pins) connecting the lugs to the case. Use a dedicated spring bar removal tool: insert the tip into the lateral groove of the lug, push the bar inward, extract the lug. Repeat on the opposite side. This operation requires care to avoid scratching the stainless steel case. Many owners prefer entrusting this operation to a specialist service.

All straps with a 20mm lug width are compatible. On milanostraps.it, artisanal straps are available in alligator, vegetable leather, NATO and rubber, specifically dimensioned for this lug width. Compatibility is guaranteed by measuring the inner passant width: it must correspond to 20mm to eliminate lateral play.

A quality leather strap (alligator or vegetable-tanned calf) lasts approximately 3-5 years with moderate daily use, extending beyond 7-8 years if worn occasionally. Lifespan depends on exposure to moisture, perspiration and mechanical stress. Vegetable tanning ages well, developing protective patina; to extend useful life, avoid prolonged exposure to direct sunlight and intense humidity. FKM rubber has superior longevity (8-10 years) due to intrinsic chemical resistance.