Strap for Big Crown ProPilot Alarm Stainless Steel / Black / Alligator

The lug width of the ProPilot 01 910 7745 4084-Set LS is 22mm, a standard declared by Oris for this aviator chronograph family. It is measured in millimetres between the inner lugs of the case, ensuring a balanced visual proportion on the 44mm case diameter.

The ideal strap depends on intended use. For fidelity to the pilot DNA, a NATO strap in grey or dark blue fabric maintains the aviation identity. If formal versatility is sought, a calf leather strap with vegetable tanning in cognac offers aesthetic evolution over time. For extreme environments, FKM rubber is the definitive choice for chemical resistance and durability.

The strap is changed by removing the fixing pins (small rods) that connect the lugs to the case. Use a springbar tool or dedicated instrument to avoid scratching the case. Insert the new strap, aligning the holes correctly, then reinsert the pins until they click into place. Verify that the strap is secure before wearing the watch.

Any strap with a 22mm lug width is compatible with the ProPilot 01 910 7745 4084-Set LS. We recommend Italian crocodile or calf leather of quality, premium NATO in regenerated fabric, FKM Tropic rubber, or shell cordovan for those seeking long-term investment. Always verify that the strap lugs fit the curved attachments of the Oris case.

A strap made of leather with vegetable tanning or crocodile typically lasts 3–5 years under moderate use conditions (5–7 days per week). Deterioration is natural: leather cracks, loses elasticity, and fibres become brittle. With regular maintenance (cleaning and occasional natural wax treatment), lifespan can extend to 6–7 years. Synthetic materials such as NATO and FKM rubber typically last 8–10 years without significant aesthetic degradation.