Strap for Conquest Quartz 41mm Black

The lug width of the Longines Conquest L3.659.4.58.6 is 21mm. This measurement, taken between the two internal lugs on the case, requires specifically compatible straps and represents a precise engineering specification of this model. Accurate measurement of this distance is essential before purchasing an aftermarket strap, as even a few millimetres' discrepancy will result in incompatibility.

For the Conquest L3.659.4.58.6, we recommend an alligator strap with vegetable tanning in brown or chestnut tones, which enhances the watch's classic sporty character whilst maintaining elegance. Alternatively, a soft calf leather with natural patination offers chromatic evolution over time. For intensive and athletic use, a ballistic canvas NATO or an FKM rubber strap preserves the model's technical vocation.

To change the strap on the Conquest L3.659.4.58.6, use a spring bar removal tool. Position the watch on a soft cloth, locate the lateral grooves on the case, and gently push the spring bar inward until it releases from one side. Once removed, slide off the old strap and insert the new one, ensuring the lugs adhere correctly to the case. Confirm that the spring bars are fully inserted to prevent detachment.

Yes, aftermarket compatible straps may be used provided they respect the 21mm lug width specification. High-quality artisanal leather straps, crafted from premium hides with noble metal fittings (stainless steel or titanium), are fully compatible and often exceed the quality of factory straps. Milanostraps offers a curated selection of 21mm straps, customisable and tested for Conquest compatibility.

The lifespan of a leather strap depends on usage patterns and maintenance. A high-quality alligator or calf leather strap, with vegetable tanning and artisanal stitching, may last 3–5 years of moderate daily wear before replacement becomes necessary. Rubber or NATO straps offer comparable longevity. Exposure to perspiration, water, and direct sunlight accelerates deterioration. Casati Milano guarantees 18 months on bespoke straps and provides maintenance advice to extend useful life.