Oris
Chronoris 01 673 7739 4084-Set RS— lug 20mm

The lug width is 20mm. This is the distance between the horizontal pins that attach the strap to the case. When measured with a digital calliper, you will see an exact 20mm gap from hole to hole. All compatible straps must respect this width to fit correctly on the stainless steel lugs of the case.

The choice depends on intended use and personal style. For formal pairing, we recommend alligator in cognac or ebony with polished finish; for daily sport wear, vegetable-tanned leather or textured rubber; for maximum versatility, a NATO strap in cordura ballistic that allows quick changes without tools. Each material develops distinct tactile and aesthetic qualities over time.

Remove the watch from your wrist. Using a spring bar tool (a small implement with bent ends), insert the tip into one of the side holes where the strap meets the case. Apply gentle pressure; the pins will retract and the strap will release. Repeat on the other side. To install the new strap, position it beneath the lugs and press until the pins lock into the strap holes. No excessive force is required.

Yes, any strap with a 20mm lug width will fit perfectly onto the case lugs. Quality aftermarket straps do not compromise the watch's value if crafted from noble materials such as alligator, shell cordovan or calf. In fact, they allow you to personalise the instrument according to your aesthetic preference and use context.

A quality artisanal alligator or calf strap typically lasts 3–5 years with moderate daily wear. Longevity depends on exposure to perspiration, water, repetitive movement and maintenance. Applying leather conditioner every 12–18 months significantly extends service life. Rubber straps last longer, typically 5–7 years, as they resist water better and do not deteriorate through natural oxidation.