Longines · Conquest Heritage

Strap for Conquest Heritage 40mm Pink Gold Black

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
ReferenceL1.645.8.52.4 (aka: L16458524)
FamilyConquest Heritage
MovementLongines caliber L633.5 hours, minutes, seconds | date
CaseRose Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Conquest Heritage L1.645.8.52.4 (aka: L16458524)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Conquest Heritage L1.645.8.52.4 (aka: L16458524), seen from the bench

The Longines Conquest Heritage L1.645.8.52.4 is a 40mm pink gold sports watch that traces its lineage to the original 1954 Conquest model. It features a clean dial with baton indices, unidirectional rotating bezel, and a warm sunburst finish. The case is 18-karat rose gold with a 20mm lug width, powered by the automatic Longines L633.5 caliber with date window and offers 300-meter water resistance for recreational diving.

Frequently asked questions

What is the lug width of the Longines Conquest Heritage L1.645.8.52.4?

The lug width of the Longines Conquest Heritage L1.645.8.52.4 is exactly 20mm. This measurement is taken between the inner shoulders of the lugs, and it is the essential parameter for selecting compatible watch straps. Do not confuse this with the distance between the outer lugs, which is greater. Precise measurement with a digital calliper ensures you avoid undersized or oversized straps.

Which strap is recommended for the Conquest Heritage L1.645.8.52.4 in rose gold?

For a Longines Conquest Heritage L1.645.8.52.4 in 18-carat rose gold, alligator straps in deep burgundy or brown are ideal, or shell cordovan with vegetable tanning. These materials respect the warm tone of the case and ensure aesthetic cohesion. For informal wear, a grey-taupe nubuck or a khaki NATO strap offers contemporary contrast without compromising elegance.

How do you change the strap on a Longines Conquest Heritage watch?

The strap is changed using a spring bar remover or a small flathead screwdriver. Locate the small metal springs (spring bars) at the ends of the lugs, gently compress the upper one to release the strap, then extract carefully. Insert the new strap by aligning the hole with the lug hook, and ensure the spring clicks securely on both sides. Avoid forcing to prevent scratching the case.

Is an aftermarket strap compatible with the Longines L1.645.8.52.4?

Yes, any strap with a 20mm lug width is compatible with the Longines Conquest Heritage L1.645.8.52.4. High-quality artisan straps in alligator, shell cordovan, calf leather and canvas NATO guarantee perfect fit. Always verify the lug width before purchase to avoid incompatibility, and choose leather thicknesses appropriate to the case (not too thick, which would weigh down the wrist).

How long does a leather strap last on a Longines watch?

The lifespan of a leather strap depends on usage, material quality and care. A high-quality alligator or shell cordovan strap with vegetable tanning lasts an average of 3–5 years in daily wear. Natural leather develops a patina and may show slight signs of wear, which add character. A standard calf strap lasts 2–3 years. Specialist craftsmen can extend service life through periodic restoration and refinishing; many artisan straps come with an 18-month warranty against manufacturing defects.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only