Strap for Williams Chronograph Carbon / Extreme

The lug width of the Oris Williams 01 674 7725 8764-07 424 50FCTB is 20mm. This measurement is standard across this model and remains constant along the entire lug shoulder, simplifying the installation of aftermarket straps without requiring lateral reduction modifications.

Given the hybrid nature of this chronograph – both sporty and refined – we recommend a polished black alligator for formal settings, a navy NATO for race-heritage character, or black FKM rubber to preserve the sporty authenticity. Vegetable-tanned calf leather in cognac brown offers an evolving patina, ideal for those preferring vintage aesthetics.

The strap attachment features straight lugs without lateral angulation. Use a spring bar tool, insert the small tip into the centre of the lower lug to depress the spring, remove the original strap, position the new strap, and allow the spring to lock into place. This is a fully reversible operation requiring no watchmaking intervention.

Yes, the 01 674 7725 8764-07 424 50FCTB is fully compatible with 20mm aftermarket straps. Ensure your chosen strap is specifically dimensioned for 20mm width and that spring bar diameters conform to standard specifications (1.8-2.0mm). Milano Straps offers a comprehensive collection of 20mm straps tested for this model.

Lifespan varies depending on material and usage patterns. A quality artisanal alligator or vegetable-tanned calf strap, subjected to daily wear without frequent water immersion, typically maintains its aesthetic integrity for 3-4 years. After 4-5 years, whilst still functional, the leather exhibits natural wear. FKM rubber maintains its elastic properties for 5-7 years. We recommend rotating between multiple straps to extend individual longevity.