Strap for Conquest Automatic 39

The lug width of the Longines Conquest L3.656.4.76.2 is 19mm. This is the precise space between the two metal lugs on the case where the strap attaches. To verify correctly, place a ruler or calliper between the lugs: any compatible strap must measure exactly 19mm in width.

The most appropriate choice is American alligator, particularly specimens with regular texture grain. This leather delivers discreet elegance proportionate to the 39mm case diameter. Sound alternatives include vegetable-tanned calf for those desiring natural patina development, or canvas NATO straps for sporty configurations. Avoid excessive thickness that would unbalance the case.

To change the strap, you must remove the spring bars that connect the strap to the lugs. Use a dedicated spring bar tool to gently push the bar inward, freeing one end of the strap. Remove the old strap and, reversing the process, insert the new one until both spring bars click into position. If uncertain, Casati Milano atelier offers professional strap-change services.

Yes, any strap with 19mm lug width is compatible with your Conquest. Always verify the exact width before purchase. Quality aftermarket straps—alligator, calf, rubber—fit perfectly onto the case lugs without altering watch functionality. Milanostraps offers a comprehensive collection of 19mm straps, fully customisable in width, initials, and thread colour.

A quality leather strap (alligator or vegetable-tanned calf) typically lasts 3–5 years with normal daily wear, depending on usage frequency and climate conditions. Humidity accelerates wear; dry environments extend longevity. Casati Milano straps come with 18-month warranty and robust construction for extended durability. The natural patina that develops is an aesthetic quality, not a defect.