Strap for WilliamsF1 Team Day Date 42 Stainless Steel / Black / Rubber

The lug width of the Oris Williams 01 635 7613 4164-07 4 24 44 is 24mm. This measurement is the linear distance between the inner shoulders of the case lugs, where the strap anchors via spring bars. Measuring this precisely is essential to ensure correct aftermarket strap replacement.

The optimal strap choice depends on intended use and aesthetic preference. For formal elegance, we recommend vegetable-tanned alligator in black or box calf in havana colour. For absolute durability and sporting contexts, high-density polyamide NATO or vulcanised FKM rubber with micro-structured texture are unrivalled. Vegetable-tanned alligator develops natural patina over time, transforming the Williams into a sartorial statement.

To change the strap, remove the spring bars securing it to the case lugs. Use a dedicated spring bar tool to compress the bars and extract them from the lugs. Once removed, position the new 24mm strap on the lugs, align it correctly, and reinsert the spring bars until you hear the locking click. If inexperienced, we recommend consulting a professional watchmaker or our Casati Milano atelier.

Any strap with a 24mm lug width is dimensionally compatible with the Williams. However, construction quality varies significantly: not all 24mm straps possess identical finishing grade, surface treatment, or long-term durability. We recommend selecting specialised suppliers with documented experience in qualitative matching, such as Milano Straps, to ensure functional and aesthetic compatibility.

Leather strap longevity depends on material, tannage, and usage patterns. High-quality vegetable-tanned alligator, properly maintained, can last 5–8 years or longer, developing fascinating natural patina. Box calf with water-repellent treatment typically lasts 3–5 years under moderate use. In hot climates or with prolonged perspiration exposure, alternating leather straps with rubber or NATO options is advisable to extend useful life of both.