Strap for Conquest Automatic 29.5 Ceramic Diamond

The lug width of the Longines Conquest L3.299.0.57.7 is 20 millimetres. This measurement is the distance between the two spring bars that attach the strap to the case. It is essential to verify this measurement before purchasing an aftermarket strap to ensure perfect compatibility and avoid damage to the attachment mechanism.

The best strap depends on usage and aesthetic preferences. African alligator offers elegance and a patina that develops over time. Shell cordovan guarantees decade-long durability and extraordinary colour evolution. Vegetable-tanned calf leather is ideal for those preferring softness and restraint. Fabric NATO amplifies the sporty character. For the Conquest, dark brown alligator or burgundy shell cordovan create sophisticated pairings with the ceramic case.

Strap replacement requires a specific tool: a spring bar tool. Remove the old strap by using the tool to compress the spring pin from one side, extract it gently, then repeat from the other side. Insert the new strap's pins into the lug holes, ensuring they are parallel to the case. If you prefer to avoid risk, entrust the task to a specialised watchmaker.

Yes, the 20mm strap is compatible with any watch that has the same lug width. However, the case diameter of the Conquest (41 mm) and the sporty-elegant styling of this collection require proportionate straps. A 20mm strap designed for the Conquest fits poorly on watches with a diameter below 38 mm, where it appears visually oversized.

Durability depends on the material and usage. Alligator and shell cordovan last 5–10 years with regular daily wear, thanks to their dense fibrous structure. Vegetable-tanned calf leather has a longevity of 3–5 years. Leather is an organic material: exposure to sunlight, sweat and humidity accelerates ageing. Rotating between multiple straps extends the overall lifespan of each.