Longines · HydroConquest

Strap for Hydroconquest Quartz 29.5

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

Lug width20 mm
Case diameter30 mm
ReferenceL3.247.4.87.6 (aka: L32474876)
FamilyHydroConquest
MovementLongines caliber L250 hours, minutes, seconds | date
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 L3.247.4.87.6 (aka: L32474876)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The HydroConquest L3.247.4.87.6 (aka: L32474876), seen from the bench

The Longines HydroConquest reference L3.247.4.87.6 is a diving watch with hour, minute, second and date functions. It features the Longines L250 caliber for time and date display. The watch belongs to the Swiss brand's sports collection dedicated to water sports.

Frequently asked questions

What is the lug width of the Longines HydroConquest L3.247.4.87.6?

The lug width of the Longines HydroConquest L3.247.4.87.6 is 20mm. This measurement represents the internal distance between the case lugs and determines the complete compatibility of any aftermarket strap. It is important to measure this dimension accurately using a digital calliper, positioning it between the two internal holes of the lugs.

What is the best strap for the Longines HydroConquest L3.247.4.87.6?

The choice of the best strap depends on the intended use. For formal and professional settings, we recommend an alligator strap with regular texture and well-defined scutes. For daily use with evolving patina, a superior quality calfskin is ideal. For aquatic and sporting environments, a structured rubber strap guarantees moisture resistance and flexibility. All materials are available with a deployante clasp for perfect integration with the 29.50mm case.

How do I change the strap on the Longines HydroConquest L3.247.4.87.6?

Changing the strap is a simple operation. Obtain a spring bar tool. Position the watch with the strap facing upwards, insert the tip of the tool under the tension spring of the lug, gently push outward until the metal pin is released. Remove the old strap and insert the new one, aligning the holes with the lug, pressing until the spring clicks into position. Repeat the operation on the opposite lug.

Can I use an aftermarket strap compatible with the Longines HydroConquest L3.247.4.87.6?

Yes, absolutely. Any strap with a 20mm lug width is completely compatible with the Longines HydroConquest L3.247.4.87.6. On milanostraps.it you will find a wide selection of 20mm straps in various materials (alligator, calfskin, vegetable-tanned leather, rubber) all ready for shipment and customisable in sizes, initials and choice of stitching thread.

How long does a leather strap last on the Longines HydroConquest L3.247.4.87.6?

The lifespan of a leather strap depends on the quality of the material and conditions of use. A superior quality calfskin or alligator strap, used under normal conditions, has an average lifespan of 3-4 years. A vegetable-tanned leather strap, being more robust, can last 4-5 years. Frequent exposure to moisture and chlorine accelerates wear. To prolong durability, it is advisable not to wear the watch during frequent swimming and to store it in a dry environment. Casati Milano offers an 18-month warranty on all custom-made straps.

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