Strap for Conquest Automatic 39 Ceramic

The lug width of the Longines Conquest L3.655.4.56.2 is 19mm. This dimension represents the internal distance between the two shoulders of the case where the strap attaches. It is essential to verify this measurement before purchasing an aftermarket strap, as an incorrect lug width would cause instability and potential damage to the case. All straps offered by Milano Straps for this model are precisely calibrated to 19mm.

The choice depends on usage and aesthetic preferences. For formal and refined daily wear, we recommend a dark brown or black alligator strap, which enhances the elegance of the bimodal case. For those alternating between sport and office, a vegetable-tanned calf leather offers versatility and ages beautifully. If the watch is destined for marine or intensive sporting environments, technical FKM rubber guarantees durability and easy maintenance. Vegetable-tanned calf represents the ideal compromise between refinement and daily robustness.

Changing the strap requires specific tools: a spring bar tool and a protected work surface. Position the watch with the strap facing upwards, insert the spring bar tool into the slot of the case lug to release the spring tension, then gently extract the bar supporting the strap. Repeat on the opposite side. Insert the new bar into the new strap, position the ends in the case lugs, and press until you feel the spring click. If you are uncertain, our experts at Casati Milano provide assistance by appointment.

Yes, provided they respect the 19mm lug width. High-quality aftermarket artisanal straps (full-grain leather, certified alligator, FKM rubber) often offer superior aesthetics and durability compared to original Longines straps. Milano Straps offers a selection of 19mm straps customizable in colour, thickness, and stitching, tested on Conquest models. Every purchase includes compatibility advice and maintenance guidance.

The lifespan of a leather strap depends on the tanning method, leather quality, and daily use. A vegetable-tanned calf, worn moderately (5–7 days per week), lasts 4–6 years before replacement is necessary. An alligator leather, given its denser texture, may last 6–8 years. Exposure to sweat, salt water, and UV rays accelerates deterioration. Artisanal straps from Milano Straps include an 18-month warranty; to extend useful life, we recommend periodic maintenance with conditioning creams specifically designed for leather.