Strap for Oris Big Crown 01 745 7629 4061

The lug width of this model is 22 millimetres (measured inside to inside). This specific measurement is designed for the Big Crown variant with a 44-millimetre case diameter, ensuring optimal proportions between the strap and the case's visual mass. To verify accurately, use a calliper positioned directly between the lugs, measuring from inside edge to inside edge.

The ideal strap depends on intended use and personal aesthetic preference. For formal elegance, we recommend alligator leather or European calf in dark tones. For robust daily wear, NATO nylon or FKM rubber provide tactical reliability. For those who appreciate natural patina and aging, vegetable-tanned leather develops character over time. Each choice enhances the Big Crown's aviatory heritage differently.

To change the 22-millimetre strap, obtain a spring bar remover or dedicated strap tool. Insert the flat tip into the small hole above the lug, gently pushing downward to release the spring. Repeat on the opposite side, removing the lug from the old strap. Insert the lugs into the new strap, ensuring the spring snaps securely. Avoid excessive force to prevent case damage.

Yes, any strap with a 22-millimetre lug width is compatible with this model. Quality aftermarket straps—in artisanal leather, certified NATO, or FKM rubber—mount identically to original straps, using the same lugs as your watch. Milanostraps offers a curated selection of 22-millimetre straps designed to enhance the aesthetics of pilot's watches like the Big Crown.

Longevity depends on leather type, tanning method and usage intensity. European calf tanned vegetally, worn occasionally, may last 5-7 years before replacement, developing desirable patina along the way. Alligator offers greater longevity (7-10 years) due to denser fibre structure. Thin leather in humid or salt-air environments deteriorates more rapidly (2-3 years). Rotating between multiple straps significantly extends the lifespan of each.