Strap for Conquest Quartz 25

The lug width of the Longines Conquest L3.158.4.16.6 is 12 millimetres. This non-standard measurement requires a specific search for compatible straps. To measure it accurately, use a digital calliper between the internal points of the two case lugs.

Alligator represents the aesthetic apex for the Conquest L3.158.4.16.6, thanks to its natural grain and golden patina that develops over time. For daily use, vegetable-tanned calf leather offers immediate suppleness and distinctive patina development. Shell cordovan combines structural robustness with inherent lustre, maintaining consistent colour vibrancy.

To change the strap, use a spring bar tool: position it beneath the lug pin, apply gentle pressure to release the internal spring, then extract the pin. Repeat on the opposite side. Align the new strap holes with the case lugs and reinsert the pins until they click into position. Ensure pins are fully seated.

Yes, any strap with a 12-millimetre lug width is compatible with the L3.158.4.16.6. We recommend selecting artisans specialising in premium leathers (alligator, shell cordovan, calf) who craft custom lugs, ensuring precision and construction quality consistent with Longines excellence.

A premium leather strap, treated with vegetable tanning or shell cordovan, lasts approximately 3–5 years under daily use whilst developing characteristic patina. Alligator, owing to its structural robustness, may exceed 5 years. Longevity depends on ambient humidity, cleaning frequency, and lug construction quality.