Strap for Big Crown ProPilot Big Date Bronze / Black / Fabric

The lug width is precisely 20 millimetres. This specification is critical for selecting a compatible strap: any variation will alter both the visual proportion and the wrist fit of the watch.

An alligator leather strap with vegetable tanning or a woven NATO strap are the optimal choices. Alligator leather emphasises the patina development of the bronze case, whilst NATO fabric ensures practicality and moisture resistance during flight operations.

The strap is changed by extracting the spring bars that pass through the case lugs. A dedicated tool or small lever facilitates the operation: press the spring bar from one side and pull it out from the lug, then repeat on the opposite side. Insert the new spring bars into the strap and secure to the lugs.

Yes, provided it is specifically designed for 20mm lug width. Artisanal straps from Milano Straps are manufactured with precise tolerances for this reference and guarantee full compatibility with the original Oris spring bars.

A quality leather strap with vegetable tanning will last 2–4 years under moderate use conditions. Aeronautical humidity and UV exposure accelerate ageing; periodic maintenance such as water-proofing treatment extends longevity significantly.