Longines · HydroConquest

Strap for Hydroconquest 41 Quartz Chronograph Stainless Steel / Blue / Bracelet

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter41 mm
ReferenceL3.743.4.96.6 (aka: L37434966)
FamilyHydroConquest
MovementLongines caliber L440.2 hours, minutes, small seconds | date | Chronograph, Rattrapante
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the HydroConquest L3.743.4.96.6 (aka: L37434966)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The HydroConquest L3.743.4.96.6 (aka: L37434966), seen from the bench

The HydroConquest reference L3.743.4.96.6 features the Longines L440.2 caliber with hour, minute, small second, date and rattrapante chronograph functions. The movement offers advanced chronograph complications with split-time measurement. The case features 21mm lugs for the strap.

Frequently asked questions

What is the lug width of the Longines HydroConquest L3.743.4.96.6?

The lug width is 21 millimetres. This dimension is specific to this model and does not match the most common standards (20 mm or 22 mm). It is essential to verify compatibility before purchasing an aftermarket strap, as an incorrect size would result in unacceptable lateral play or impossible installation.

Which strap is most suitable for the Longines HydroConquest L3.743.4.96.6?

Alligator in vegetable tanning, Italian calf leather, and shell cordovan are the most balanced options for this chronograph. Alligator imparts formal elegance, calf leather develops natural patina over time, whilst cordovan offers density and resilience. For sports use or humid environments, FKM rubber or NATO fabric straps represent the technical alternative.

How do I change the strap on my Longines HydroConquest L3.743.4.96.6?

The strap is secured via spiral springs (spring bars) housed in the case lugs. Using a dedicated tool (spring bar tool), compress the spring to disengage it from the mounting hole. Remove the spring on one side, slide off the old strap, then insert the new strap and reinsert the spring until the retention click is heard. We recommend verifying the click twice to ensure security.

Can I fit an aftermarket strap on my Longines L3.743.4.96.6?

Yes, provided the lug width is precisely 21 millimetres. Bespoke artisanal straps guarantee perfect compatibility and allow you to select materials, colourways, and construction details (buckle type, deployant, thread colour) according to your aesthetic and functional preferences.

How long does a leather strap last on my Longines HydroConquest?

Durability depends on material and use conditions. An alligator or shell cordovan strap in vegetable tanning lasts 3–5 years with moderate daily wear. Calf in vegetable tanning has similar longevity but develops patina more rapidly over time. Frequent exposure to water, perspiration, and UV radiation reduces longevity. High-quality artisanal straps carry an 18-month warranty and can be professionally refurbished.

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