Longines · HydroConquest

Strap for Hydroconquest Quartz 25 Two Tone

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

Lug width20 mm
Case diameter25 mm
ReferenceL3.147.3.36.7 (aka: L31473367)
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 L3.147.3.36.7 (aka: L31473367)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The HydroConquest L3.147.3.36.7 (aka: L31473367), seen from the bench

The Longines HydroConquest reference L3.147.3.36.7 is a dive watch from the Swiss brand's sports collection. It features the L250 caliber with hour, minute, second and date indications. The model is part of the line dedicated to water sports with specific technical features for diving.

Frequently asked questions

What is the lug width of the Longines HydroConquest L3.147.3.36.7?

The lug width of the Longines HydroConquest L3.147.3.36.7 is precisely 20mm. This measurement is taken from the inner distance between the two lugs and determines compatibility with aftermarket straps. A 20mm strap installs correctly using standard spring bars, without play or forced fitting.

What is the best strap for the Longines HydroConquest L3.147.3.36.7?

The optimal strap depends on your intended usage. For formal occasions, alligator in black or cognac brown offers elegance and longevity; for sports styling, vegetable-tanned calf in tobacco colour emphasises functionality; for humid environments, canvas NATO or vulcanised rubber keeps your wrist dry. Your choice reflects the balance between aesthetic preference and practicality.

How do you change the strap on the Longines HydroConquest L3.147.3.36.7?

The strap is changed by removing the two spring bars securing it to the lugs. Using a dedicated spring bar tool or a thin flat implement, push one spring bar inward, releasing it from its seat. Repeat on the opposite side. Then insert the new strap, ensuring both spring bars click firmly into position. The procedure takes minutes and requires no specialist skills.

Which aftermarket straps are compatible with the Longines HydroConquest L3.147.3.36.7?

Any strap with a 20mm lug width is compatible with the L3.147.3.36.7. Options include alligator, vegetable-tanned calf, shell cordovan, NATO textiles, rubber and smooth leather. Online at milanostraps.it you can access a wide selection of customisable options for length, initials and thread colour, with fast shipping across Europe.

How long does a leather strap last on the Longines HydroConquest L3.147.3.36.7?

Leather strap longevity depends on material quality, frequency of wear and maintenance. A quality alligator or calf strap, worn daily and subject to routine care (cleaning with damp cloth, protection from excessive moisture), lasts 5-7 years. More delicate leather straps may degrade in 2-3 years. Rubber or canvas NATO straps exceed 10 years of life if not exposed to prolonged UV radiation.

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