Strap for Big Crown ProPilot Big Date Stainless Steel / Black / Leather

The lug width of the Oris ProPilot 01 751 7761 4164-07 6 20 07LC is exactly 20 millimetres. This measurement is taken between the two lateral lugs (attachment points) of the case, from pin to pin. A 20mm lug width is the standard for a 41mm case, providing optimal ergonomic proportions without aesthetic or functional compromise. Every artisanal strap must be specifically manufactured to this geometry.

The choice depends on usage context. An alligator strap in cognac or dark brown creates refined aesthetic contrast with the steel case, enhancing dial legibility. A vegetable-tanned calf leather applies sober construction philosophy with a natural patina that evolves over time. NATO canvas straps offer tactical versatility and rapid changes, whilst elastomers (FKM rubber) provide superior thermal resistance and grip. For the ProPilot, we recommend a steel deployante buckle that maintains the visual cohesion of the case.

Strap changes are executed by removing the two pins (bars) connecting the lug to the case. Use a dedicated tool (pin removal tool) or a small screwdriver, inserting the stem into the lateral access hole until the pin slides free. Remove the lug with care, avoiding forced manipulation of the attachment mechanisms. Insert the new 20mm strap by aligning the lugs with the case holes, then reinsert the pins. The procedure requires a few minutes and no specialist technical knowledge.

Yes, any artisanal strap manufactured to a 20-millimetre lug width specification is compatible with the ProPilot 01 751 7761 4164-07 6 20 07LC. Compatibility is guaranteed by ISO standardisation of lug width: the pins remain unchanged, whilst strap body variation occurs in thickness, grain texture, colour and material. Milanostraps offers a complete selection of 20mm straps in leather, NATO and rubber, all verified for precise fitment on this Oris reference.

The lifespan of a leather strap depends upon intensity of use and construction quality. An alligator or vegetable-tanned calf strap, subjected to daily and moderate wear, has an average life of 3–5 years. Vegetable-tanned leather develops a natural patina that may become increasingly attractive in early years, although micro-fractures in the grain increase proportionally. A NATO canvas strap has superior lifespan (5–8 years), owing to absence of degradable organic materials. Elastomers (FKM rubber) guarantee even greater resistance (7–10 years) in corrosive environments or with the extreme thermal variations typical of aviation.