Strap for Conquest Automatic 41mm Blue

The lug width of the Longines Conquest L3.658.4.96.6 is 21mm. This width is specific to this model and corresponds to the geometry of the 41mm case. To verify it precisely, use a digital calliper measuring the internal space between the two horizontal attachments (lugs). It is not possible to use straps with different measurements (20mm or 22mm) as the mechanical clearance on the lug is minimal and would damage the case.

The best strap depends on use and context. For an elegant-sporty option, we recommend an alligator with vegetable tanning and marked grain, which enhances the sporting character of the Conquest. For formal settings, a calf in cognac or dark brown shade with tight stitching. For casual or summer use, a NATO cordura in slate grey or a rubber strap with regular grooves maintains the "tool" vocation of the watch. Shell cordovan in deep burgundy is the luxury choice for those who appreciate patina evolution over time.

Strap change is straightforward: use a spring bar tool to gently compress the small internal spring of the lug. Insert the tool tip into the horizontal slot, press inward and extract the metal pin. Repeat on the other side. To fit the new 21mm strap, align the strap lug with the two holes on the case and reinsert the metal pins. Ensure the strap is firmly secured before wearing the watch.

Yes, you can use aftermarket straps provided they have an exact 21mm lug width. High-quality aftermarket straps made from premium leather (alligator, shell cordovan, vegetable-tanned calf) or technical materials (NATO, rubber) fit perfectly on the Conquest. We recommend choosing straps custom-made for this width rather than standard undersized or oversized solutions, which would compromise the fit and visual appearance of the case.

The lifespan of a leather strap depends on the material, tanning and daily use. An alligator or calf with vegetable tanning, used regularly, lasts on average 4-6 years before the material starts showing signs of wear around the buckle or lugs area. Shell cordovan, being denser, can reach 8-10 years. Rubber or NATO straps last longer (10-15 years). Exposure to sunlight, humidity and water accelerates ageing. Minimal maintenance (balm for vegetable-tanned leathers every 6 months) significantly extends strap life.