Strap for Conquest Heritage 40mm Black Dial

The Longines Conquest Heritage L1.645.4.52.4 features a lug width of 20mm. This measurement represents the internal space between the two lugs on the case and determines compatibility with any aftermarket strap. To verify this dimension on your watch, use a digital calliper positioned between the two spring bar holes.

The ideal strap depends on your use case. For formal occasions, alligator leather in brown or black elevates the watch's refined character. For a sportier profile, a NATO fabric or rubber strap reinforces its heritage as a professional instrument. Vegetable-tanned calfskin represents the versatile compromise, developing a desirable patina over time.

Strap replacement requires extraction of the spring bars connecting the strap to the lugs. Obtain a spring bar tool or a small pointed object. Position the watch with the strap facing upwards, gently press inward on one of the two lateral spring bars until it disengages, then slide out the strap. Repeat for the opposite lug and insert the new strap by reversing this procedure.

Yes. All straps manufactured for the 20mm lug width are compatible with your L1.645.4.52.4. On milanostraps.it you will find a selection of artisanal straps specifically designed for this measurement, each tested for mechanical coherence with Longines standard lugs. Customisation is available for sizing, embroidered initials, and stitching thread colour selection.

Longevity depends on usage frequency, material quality, and maintenance practices. A quality vegetable-tanned strap typically lasts 5–8 years with moderate wear, developing a desirable patina over time. Alligator leather lasts considerably longer, often exceeding 10 years. Shell Cordovan, exceptionally durable, surpasses 15 years. Prolonged exposure to moisture and UV radiation accelerates ageing. Regular maintenance—gentle cleaning, avoiding stagnant water—significantly extends the operational lifespan of the strap.