Strap for Hydroconquest Chronograph

The lug width of the Longines HydroConquest L3.665.4.76.2 is 20mm. This measurement is critical for strap compatibility and must correspond exactly to the distance between the two attachment points on the case. A 20mm strap ensures optimal fit and stability during daily wear or diving operations.

For the L3.665.4.76.2, we recommend cognac alligator for classical elegance, black vegetable-tanned calf grain for sporting austerity, or burgundy cordovan if the dial is dark blue. For intensive water use, a rubber or technical silicone strap is the ideal choice. The selection depends on intended use and desired aesthetics: vegetable-tanned leather develops a fascinating patina over time, whilst rubber offers performance without maintenance.

To change the strap, you must remove the spring bars that connect the strap to the case lugs. Using a dedicated tool (spring bar tool) or small lever, gently push the bar inward to release it. Once freed, the strap slides away from the lugs. Reverse the procedure with the new 20mm strap, ensuring the spring bars are fully inserted and secured. If you are inexperienced, a professional watchmaker will complete the operation in minutes without risk.

Yes, any 20mm strap is compatible with the L3.665.4.76.2, provided the spring bars are of identical length and diameter. Artisanal 20mm straps from milanostraps.it are tested and compatible with this model and offer customisation options (final length, initials, stitching thread choice) unavailable in stock straps. Casati Milano atelier also creates bespoke options in selected leather.

The lifespan of a leather strap depends on material and use. Vegetable-tanned leather typically lasts 3–5 years in daily wear, developing a compelling patina. Alligator is more durable and may last 5–8 years. Technical rubber and NATO last indefinitely. In frequent aquatic environments, leather tends to weaken more rapidly. The ageing of vegetable-tanned leather is not a defect: it is the natural evolution of the material, becoming softer and acquiring character over time.