Strap for Conquest 29.5 Quartz Moonphase Stainless Steel / Black / Bracelet

The lug width of the Longines Conquest L3.380.4.58.6 is 15mm. This dimension represents the perpendicular distance between the two attachment points where the strap connects to the case. Selecting a strap with precisely 15mm width ensures correct mechanical compatibility and visual harmony with the 29.5mm case.

The model pairs excellently with alligator, shell cordovan, vegetable-tanned calf, and NATO textile straps. For a classic formal aesthetic, cognac or burgundy alligator is recommended; for daily versatility, charcoal calf or anthracite NATO. The choice depends on intended use and desired aesthetic tone.

Position the watch on a soft cloth, case facing upward. Using a spring bar tool, gently press the spring from the inside, pushing the spring bar endpin outward from the lug hole. Once the spring bar is released, remove the old strap and insert the new one, ensuring the spring bar sits correctly in its housing. When in doubt, consult an authorised service centre.

Any strap with a 15mm lug width is compatible with the Conquest L3.380.4.58.6, provided the spring bar attachments are well-manufactured with precise tolerances. Avoid generic or unknown-brand straps; the quality of the spring bar attachment points determines durability and safety. We recommend specialist artisanal strap makers to guarantee certainty of fit.

Durability depends on material and usage. A vegetable-tanned calf strap lasts approximately 3–4 years with daily wear, developing an attractive patina. Alligator, being more robust, resists 5–6 years. Moisture damage accelerates deterioration. We recommend rotating straps and protecting leather from sweat and heavy rain. Having a replacement strap is always advisable.