Strap for WilliamsF1 Team Engine Date 40.5 Stainless Steel / Rubber

The lug width (distance between the lugs) of the Oris Williams 01 733 7560 4114-07 4 25 01 is 20mm. This measurement corresponds to the spacing between the pins that attach the strap to the case. To verify it accurately, remove the original bracelet and measure with a digital calliper the distance between the two lugs at the centre point where the strap naturally sits. The lugs on the Williams are particularly robust, reflecting its intended use in demanding sporting environments.

The most suitable strap depends on your intended use and personal aesthetic preferences. For formal elegance, alligator leather with vegetable tanning offers sophisticated aesthetics and a natural patina that develops over time. For daily durability, a structured calf such as Pueblo provides robustness and a lived-in appearance. For sport and humid environments, FKM rubber guarantees water resistance and freedom from deterioration. NATO straps in Cordura fabric maintain the racing DNA whilst offering practicality and modularity.

To replace the strap, position the watch with the lugs facing upwards. Using a spring bar tool, push the elastic lug pin towards the centre of the case to free the end. Gently remove the old strap, then insert one lug pin of the new strap into the housing and, whilst maintaining pressure, release the tool. Repeat the operation on the second lug. Verify that the strap is perfectly aligned and that the lug pins are fully seated in the housings before wearing the watch again.

Any strap with a 20mm lug width is compatible with the Oris Williams 01 733 7560 4114-07 4 25 01. You can choose from alligator, calf leather, ostrich skin, shell cordovan, NATO fabrics, Cordura elastics, and technical rubbers such as FKM or Vitone. Always ensure that the declared width is precisely 20mm and that the strap thickness at the lug junction point is appropriate for the case housings, typically between 4 and 5mm.

The durability of a leather strap varies according to the material, tanning method, and intensity of use. An alligator or vegetable-tanned calf can last between 3 and 7 years in moderate daily wear, developing a natural patina that enhances its character. Frequent exposure to humidity, direct UV rays, or abrasion accelerates ageing. Particularly waxed or oil-treated leather tends to last longer. To extend strap life, avoid frequent wetting and, if it occurs, dry it quickly with a soft cloth. Regular strap replacement is nonetheless part of normal watch maintenance.