Oris
Big Crown 01 754 7779 4063-Set— lug 19mm

The lug width is precisely 19.00mm, measured between the two horizontal pins securing the strap to the case. This dimension is specific to this reference and demands bespoke strap solutions, as 19mm does not represent an industrial standard shared with other models.

The optimal choice depends on intended use. A vegetable-tanned calf or alligator leather in dark brown emphasises the aviator heritage; midnight-blue calf combines formal elegance with daily versatility; a grey or navy NATO offers practicality and contemporary aesthetic. For aquatic activities, butadiene rubber ensures rapid drainage.

Use a spring bar removal tool (flat-tipped lever). Insert the lever into the access hole on the case back, near the spring pin: apply gentle pressure to release the spring, then extract the pin. Repeat on the opposite side. Install the new strap by reversing the procedure, ensuring both pins are fully seated.

Yes, it is compatible with any artisanal 19mm strap, provided precision manufacturing is observed. The 19mm dimension is an exact constructive specification ensuring correct mechanical coupling. Avoid approximate tolerances: an 18.5mm or 19.5mm strap will create excessive play or insertion difficulty.

A high-quality natural leather strap (alligator, calf, shell cordovan) lasts 3–5 years in daily use, developing patina and character over time. Longevity depends on exposure to humidity, perspiration, and sunlight. A NATO nylon strap resists 5–7 years; rubber 4–6 years. Regular maintenance (gentle cleaning, conditioning) extends lifespan considerably.