Strap for Williams Day Date 42 Stainless Steel / Blue / Rubber

The Oris Williams 01 735 7716 4155-07 4 24 50FC is fitted with a 24mm lug width, also referred to as the distance between the two vertical case lugs. To verify strap compatibility, measure with precision (preferably using a calliper) the internal distance between the two lugs: the measurement must correspond exactly to 24mm.

Your choice depends on intended usage and aesthetic preferences. For refined elegance, we recommend vegetable-tanned alligator, which develops a natural patina over time and complements the case's sporty design gracefully. For maximum practicality and visual sportiness, a navy or black canvas NATO strap amplifies the motorsport DNA. A sophisticated alternative is calf leather with a deployante clasp, offering comfort and versatile wear. For water sports enthusiasts, an FKM rubber strap provides superior grip and durability.

Removing the strap requires a specialist tool called a spring bar tool. Place your watch on a stable surface, insert the tool under the spring bar tube and apply gentle upward pressure until it releases. Once free, extract the strap from both lugs. To install a new strap, insert one end into the upper lug first, align the spring bar tube, and press downward until it clicks into place. Repeat for the lower lug, ensuring the strap is centred and symmetrical.

Yes, any strap with a 24mm lug width is compatible with this model. The quality aftermarket offers many solutions: artisanal vegetable-tanned alligator and calf leather, shell cordovan, technical rubber, and NATO straps. Verify that the lug width is exactly 24mm and that the spring bar tubes have standard diameter (1.5–2.0mm). A quality strap, correctly installed, does not compromise the watch's reliability.

A quality leather strap, properly maintained, typically lasts 3–5 years with regular and varied use. Daily wear without protection against excess moisture or mechanical stress may accelerate deterioration. Proper maintenance—drying the strap after water contact, avoiding prolonged direct sunlight, occasionally applying a leather conditioner—significantly extends longevity. Vegetable-tanned alligator straps can exceed 5 years while developing characteristic patina; FKM or silicone rubber straps have a more predictable lifespan of 3–4 years before showing signs of hardening or deformation.