Strap for Conquest Quartz 25 Diamond

The lug width of the Longines Conquest L3.158.0.89.6 is 12mm. This measurement represents the internal distance between the two lugs of the case. To verify, remove the original strap and measure with a digital calliper the distance between the inner edge of one lug and the other. Any strap with a width different from 12mm will not be compatible.

For the compact proportions of this 25mm model, we recommend vegetable-tanned alligator with fine grain, or structured calf leather. Both maintain the refinement of the case without adding weight. For more casual contexts, a cotton or silk NATO strap is a versatile and understated choice.

The change is accomplished by removing the spring bars that secure the strap to the case lugs. Use a specialised tool or a small flat-head screwdriver to compress the internal pin, creating the space to remove the strap. Ensure the new strap has precisely 12mm lug width and that the spring bars are positioned securely.

Yes, provided it is constructed for 12mm lug width. Aftermarket straps of artisanal quality, such as those made from alligator or shell cordovan, guarantee geometric compatibility and often superior build quality compared to OEM straps. Always verify specifications before purchase.

A quality leather strap (vegetable-tanned alligator or shell cordovan) typically lasts 3–5 years with moderate daily use. Durability depends on the quality of tanning, frequency of use, exposure to moisture, and maintenance standards. Artisanal straps require occasional gentle cleaning and, if necessary, conditioning with products formulated for leather.