Strap for Conquest Chronograph

The lug width of the Longines Conquest L3.678.4.76.6 is 21mm. This is an intermediate width that requires straps specifically crafted for this dimension, not interchangeable with standard 20mm or 22mm sizes. To verify with precision, measure the distance between the metal lugs where the straps articulate using a digital calliper.

For the 41mm Conquest, we recommend alligator for unwavering elegance, calf for patina development over time, or shell cordovan for those seeking a dense leather that polishes with wear. Sporty alternatives include cotton-polyester NATO fabric (summer comfort) and rubber (moisture resistance). The choice depends on primary use: formal, daily, or sport-oriented.

Position the watch on a soft surface. Locate the two metal lugs at the case sides. Using a spring bar tool or thin non-metallic object, press downward the small internal button of the spring bar from one side, gently pull the old strap free. Repeat on the opposite side. Insert the new strap aligning the holes with the springs, press down with even pressure until you hear a click.

Yes, provided the lug width is exactly 21mm. Generic aftermarket straps may present construction tolerances that result in irregular fit. We recommend specialised manufacturers that test tolerances and provide written compatibility warranty. Casati Milano and Milano Straps retailers guarantee bespoke construction specifically for this width.

A quality leather strap (calf, alligator, shell cordovan) has an average lifespan of 3–5 years with daily wear, provided regular cleaning and protection from prolonged moisture. Alligator and shell cordovan age better than calf leather. Longevity depends on climate (humidity accelerates ageing), frequency of strap rotation, and maintenance. Casati Milano provides 18 months warranty on bespoke straps.