Strap for Conquest Automatic 39

The lug width of the Longines Conquest L3.656.4.56.0 is 19 millimetres. This is the precise distance between the two lateral lugs of the case that accommodate the strap lugs. Measuring the lug width is straightforward: use a digital calliper and measure perpendicularly the distance between the outer wall of the two lugs, not the inner surface. This measurement ensures that the strap is compatible with the specific proportions of the 39mm case.

There is no universally 'best' strap, but rather choices based on usage. For elegance and versatility: brown or black alligator. For narrative patina development: calf with vegetable tanning. For performance and durability: black rubber or NATO canvas. Shell cordovan represents the ideal compromise between material density and sports sobriety. We recommend considering frequency of use (daily vs occasional) and predominant environment (office vs outdoor).

Changing the strap is simple and requires no specialised tools. Position the watch with the strap facing upward, holding the case gently from both sides. Locate the small hole at the end of each lug, inside the strap seat. Insert a spring bar tool or a thin credit card into the hole, pushing the lug downward to release the spring tension. Remove the old strap with gentle pressure. Insert the new strap and repeat the reverse procedure. If you lack experience, the Casati Milano atelier performs the change in minutes.

Yes, absolutely. All straps with a 19mm lug width are compatible with this model, regardless of manufacturer. Compatibility is determined solely by lug width, not by watch brand. Milano Straps' artisanal straps are constructed to rigid specifications for 19mm lug width and guarantee perfect fit in the Conquest. Always verify that the seller explicitly certifies 19mm compatibility before purchase.

Lifespan depends on material, usage and maintenance. A quality alligator strap, with moderate use and regular maintenance (damp cloth cleaning, annual conditioning), can last 4-6 years. Vegetable-tanned calf is more sensitive to moisture but offers similar durability with proper care. Shell cordovan is more resistant and can exceed 6 years even under intensive use. Rubber straps last 2-3 years before oxidation becomes evident. Milano Straps guarantees 18 months of normal wear on Casati Milano straps, coverage that testifies to construction quality.