Strap for Conquest Quartz 25

The lug width of the Longines Conquest L3.158.4.76.6 is 12mm. This measurement refers to the distance between the two metal bars (spring bars) that protrude from the case and hold the strap in place. Accurate measurement is essential when selecting a compatible strap; a strap measuring 11mm or 14mm will not fit correctly.

Given the refined proportions of the 25mm case, the most appropriate strap options are alligator leather (black, dark brown, cognac), calf leather (grained or vegetable-tanned finish), cotton NATO, and vulcanised rubber. Alligator emphasises sophistication; calf leather provides tactile softness and formal-casual versatility; NATO adds a sportive character; rubber ensures practicality and water resistance.

To change the strap, use a dedicated spring bar tool or a thin flathead blade. Insert the tool beneath the metal bar (spring bar) connecting the strap to the case, apply gentle pressure to retract it, and slide the strap outward. Repeat on the opposite side. To install the new strap, insert both bars into the corresponding apertures on the new strap until you hear a click indicating secure fastening.

Yes, any strap with 12mm lug width is compatible, regardless of manufacturer. Artisanal straps produced by specialised brands often offer superior quality compared to original Longines straps, with more refined leather selections, personalised stitching, and length adjustability options. The critical factor is verifying that the strap's lug width is precisely 12mm.

A high-quality leather strap, featuring vegetable tanning or alligator hide, typically lasts 3-5 years with daily wear, depending on care and environmental exposure. The leather will naturally settle and develop a characteristic patina. With proper maintenance—avoiding prolonged moisture and periodic cleaning—a strap may endure beyond 5 years. Rubber straps generally offer a slightly longer lifespan (5-7 years) due to resistance against UV rays and moisture.