Strap for Big Crown ProPilot Big Date 58th Reno Air Races

The lug width of the Oris ProPilot 01 751 7761 4124-Set is 20 millimetres. This measurement represents the vertical distance between the two attachment points on the case. It is essential to identify this dimension accurately before ordering an aftermarket strap, as it determines mechanical compatibility between case and strap. Measurement should be taken by tracing a perpendicular line from the case lugs towards the dial.

For the Oris ProPilot 01 751 7761 4124-Set, we recommend three primary options based on use context: (1) alligator or vegetable-tanned calf for those seeking formal sophistication and aesthetic ageing over time—organic leather textures harmonise with the bronze patina of the case; (2) NATO strap in military green or navy blue for those preferring functionalism and tactical reliability—the single-pass design eliminates traditional buckle fragility; (3) FKM rubber at high density for humid, maritime or extreme environments, guaranteeing minimal maintenance. Your choice should reflect lifestyle and predominant use context.

Strap replacement requires a spring bar tool (a specialised device for spring bar detachment). Procedure: (1) position the watch on a stable surface with the case facing downward; (2) insert the tool tip into the lateral notch of the spring bar and gently press to compress the internal spring; (3) extract the spring bar from its seat; (4) repeat the procedure on the opposite spring bar; (5) align the new spring bars with the case seats and insert the new strap. If you lack experience, we recommend professional consultation at Atelier Casati Milano to avoid case scratches.

Yes, the Oris ProPilot 01 751 7761 4124-Set is fully compatible with aftermarket straps of 20-millimetre lug width. The standardisation of lug width ensures mechanical interoperability with any strap certified for this dimension, regardless of brand. It is important to verify that the new strap is indeed calibrated for 20mm before purchase. At milanostraps.it you will find a curated selection of compatible straps in leather, NATO and rubber, available for immediate dispatch and customisable to your preferences.

The longevity of a leather strap depends on material quality, tanning process and frequency of use. A strap in alligator or vegetable-tanned calf leather, such as those produced by Casati Milano, maintains structural integrity for 3 to 5 years of daily wear, with gradual aesthetic ageing that increases visual value over time. Factors shortening durability include: prolonged moisture exposure without drying, frequent contact with salt sweat, excessive flexing of the lugs. FKM rubber offers superior durability (5-7 years) but ages less gracefully aesthetically. Polyamide technical NATO surpasses 8 years. Seasonal rotation between straps significantly extends the average lifespan of each element.