Strap for Conquest Heritage 40mm

The lug width of the Longines Conquest Heritage L1.645.4.75.4 is 20mm. This measurement is taken in a straight line between the inner edges of the lugs on the case. It is important to verify with a digital calliper to ensure complete compatibility with aftermarket straps, as the manufacturing tolerance must fall between 19.8 and 20.2mm.

For the Conquest Heritage L1.645.4.75.4, we recommend an alligator strap with vegetable tanning (dark brown or black) for formal wear, or shell cordovan if you seek tactile density and shape memory. For everyday use, vegetable-tanned calf leather with fine grain is ideal; for sporty character, a cotton NATO strap echoes the collection's military origins.

Changing the strap on the Conquest Heritage requires the correct tools: a spring bar tool and a scratch-free work surface. Locate the attachment lugs at the sides of the case, gently compress the internal spring with the tool, remove the old pin, and insert the new strap. Avoid hammers or brute force, which compromise the case. If uncertain, entrust the task to an authorised Longines service centre.

Yes, any 20mm strap is compatible with the L1.645.4.75.4, provided the width is nominal (19.8–20.2mm). The 20mm artisanal straps from MilanoStraps are manufactured to watchmaking standards and guaranteed to fit the Conquest Heritage case perfectly. Always verify the lug width before purchase.

The lifespan of a leather strap depends on use, climate, and tanning method. An alligator or shell cordovan strap with vegetable tanning, worn daily in temperate climate, has an average life of 4–6 years. Vegetable-tanned calf leather, more porous, varies between 3–5 years. MilanoStraps straps are guaranteed for 18 months; thereafter, maintenance and reconditioning are available through Casati Milano.