Strap for Chronoris Williams 40th Anniversary Limited Edition / Bracelet

The lug width is 20mm. This measurement is specific to this model and does not fall within the most common commercial standards (18mm, 22mm). Measure the free space between the two lugs of the case, not the diameter of the spring bar itself. A 20mm strap will fit the case without oscillation and guarantee ergonomic comfort on the wrist.

It depends on your intended use. An alligator strap (composite grain, black or chocolate-brown colour) emphasises the racing character and offers discreet luxury. Vegetable-tanned calf leather keeps the chronograph grounded in daily wear, with a patina that matures over time. For sporting activities, a NATO or vulcanised rubber respects the technical heritage of the Oris calibre 673 movement. Your choice of material expresses your intention regarding how you will wear this chronograph.

You will need a spring bar tool. Position the watch on a stable surface, locate the spring bar connecting the strap to the case, insert the bifurcated end of the tool into the narrow slot and gently push downward to release the tension of the spring bar. Remove the bar and the old strap. Insert the new strap into the spring bar and align the second hole of the lug with the opposite slot on the case, then press the bar until both sides lock into place. Verify that the strap is symmetrical to the case before closing.

Yes. Any strap with a 20mm lug width is compatible with the Oris Chronoris 01 673 7739 4084-Set MB. Verify that the width is exact (20mm) by measuring between the two lugs. A superior-quality strap (alligator, shell cordovan, solid-dyed calf) enhances the perception of luxury and comfort of the chronograph. Hand-finished artisanal straps respect the constructive integrity of the watch better than industrial-produced models.

Durability depends on the material, tanning method and use. Vegetable-tanned calf lasts 3–5 years with daily wear and ordinary maintenance (regular cleaning, quick drying after perspiration, protection from stagnant water). High-grade alligator reaches 5–8 years due to superior tissue density. Vulcanised rubber resists 2–3 years under active sporting conditions. Longevity increases if the worn strap is artisanal quality and subject to preventive maintenance (annual conditioning with natural oils). Store the chronograph away from direct heat sources and persistent humidity.