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

The lug width is 20 millimetres. This dimension positions itself within the intermediate standard and ensures compatibility with a vast range of quality aftermarket straps. To verify correct application, the strap must adhere without lateral micro-rotations around the spring bars.

Given the model's avionic heritage, we recommend a vegetable-tanned calf leather strap in natural leather or chocolate brown. Alligator finished in seal brown creates elegant contrast against the stainless steel case. For high-humidity environments or military use, FKM rubber in anthracite grey maintains performance without odour absorption.

Extract the lug spring bars using a dedicated tool (spring bar tool) or a pointed toothpick. Position the bar beneath the internal metal spring and gently lift until disengagement. Repeat on both sides, then insert the new strap in the opposite direction. Ensure the spring bar is completely seated before wearing the watch.

Yes, provided the width is certified at 20.00 mm ± 0.2 mm. Artisanal straps manufactured to this lug width specification guarantee optimal fit without lateral play. We recommend verifying the thickness of the original spring bars (typically 1.8–2.0 mm) before ordering, as the strap must correctly house the internal spring mechanism.

A calf leather strap with vegetable tanning, subjected to daily wear, maintains structural integrity for 4–6 years. Natural leather ages visibly (darkening, surface creasing), but this is intentional. The stitching, if executed with waxed nylon thread, resists for 3–5 years before requiring re-stitching. Alligator, being denser, reaches 7–10 years. FKM rubber does not degrade in terms of tensile strength, but may discolour after 8–10 years of intense UV exposure.