Strap for Williams Day Date 42 Kazuki Nakajima

The lug width of the 01 635 7613 4784-Set is 24mm (measured from center lug pin to center lug pin). This is a non-standard dimension compared to the more common 20mm or 22mm sizes, deliberately chosen by Oris to maintain balanced proportions with the 42mm case diameter. Always verify compatibility by measuring the distance between your case lugs before ordering a replacement strap.

The choice depends on intended use. For formal applications, alligator in stone grey or vegetable-tanned calf creates refined elegance. For daily durability and patina development, we recommend cognac or burgundy calf. For pure motorsport coherence, a tactical NATO canvas or FKM rubber strap maintains the racing soul of the Williams. Shell cordovan, if available in 24mm format, represents the supreme quality option with durability exceeding five years of daily wear.

Changing the strap requires a specific tool: a spring bar tool (lug remover). Position the tool in the space between the case lug and the strap, then gently lever to compress the internal spring. Simultaneously, pull the strap outward. Repeat on the other side. To install the new strap, align the hole with the pin and press with the tool until you hear the spring lock click into place. Always work on a soft surface to prevent case scratches.

Yes, any strap in 24mm format is compatible with the Williams. Quality aftermarket straps often represent a superior choice compared to OEM straps, offering greater aesthetic customisation and often exceptional artisanal construction. Verify that the strap has internal pin compatibility (typically 1.8–2.0mm diameter) and that thickness does not exceed 5mm at the lug attachment point to avoid excessive movement.

Longevity varies significantly based on material, tanning method, and intensity of use. Standard calf with daily wear rarely exceeds three years before showing significant wear. Vegetable-tanned calf, if properly maintained, lasts four to five years whilst developing a beautiful patina. Shell cordovan exceeds five years due to the extraordinary fibre density of the material. Critical factors are: exposure to perspiration, temperature fluctuations and humidity, plus cleaning frequency and use of leather-specific conditioners.