Longines · Conquest

Strap for Conquest 29.5 Quartz Stainless Steel

Takes 15 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width15 mm
Case diameter30 mm
ReferenceL3.277.4.16.6 (aka: L32774166)
FamilyConquest
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

The Conquest L3.277.4.16.6 (aka: L32774166), seen from the bench

The Longines Conquest L3.277.4.16.6 embodies the Swiss sportwear philosophy in a feminine 29.5mm stainless steel case. Born in 1954 to celebrate the K2 conquest, the Conquest family combines technical robustness with elegant proportions. The automatic L250 caliber provides hours, minutes, seconds and date display. The compact 29.5mm case features a screw-down crown and caseback. The 15mm lug width is a precise specification that maintains visual harmony with the case diameter and prevents the visual imbalance that would result from standard 16mm or 18mm lugs.

Frequently asked questions

What is the exact lug width of the Longines Conquest L3.277.4.16.6?

The lug width of the Longines Conquest L3.277.4.16.6 is 15 millimetres. This dimension is specific to this ladies' model and requires straps calibrated with precision. To measure it correctly, place a ruler from the inside of one lug to the inside of the other, passing under the case. At the Casati Milano Atelier, you may also send a photograph of the lugs for accurate verification.

Which strap is most suitable for the Longines Conquest L3.277.4.16.6?

An alligator leather strap represents the most natural choice for this 29.5mm ladies' model: the fine grain and inherent flexibility of the reptile leather adapt without rigidity to a 15mm lug width. Vegetable-tanned calf leather is equally appreciated for tactile readability and the ability to age with authentic patina. For more sporty contexts, premium vulcanised rubber offers practical wear without aesthetic compromise.

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

Strap replacement is performed via two step pins or spring bars located at the extremities of the lugs, one on each side. Use a dedicated tool (spring bar tool) to release the elastic ends of the pins, extracting them horizontally. Once the lugs are free, the strap disengages from the case. To insert the new strap, align the holes and push the pins into the case attachments until you hear the locking click. If uncertain, the Casati Milano Atelier offers a strap replacement service by appointment.

Can an aftermarket strap be used on the Longines Conquest L3.277.4.16.6?

Yes, it is possible. Milano Straps offers online a selection of straps compatible with 15mm lug width, ready for dispatch and customisable in size, initials and thread colour. Quality aftermarket straps guarantee mechanical compatibility identical to originals, with the option of selecting materials, colours and finishes according to personal preference. The Casati Milano Atelier also creates made-to-order straps with direct selection of leathers.

What is the typical lifespan of a leather strap for a Longines Conquest?

The lifespan of a leather strap depends on material quality and daily use. A high-quality alligator or vegetable-tanned calf strap can last 4-7 years under moderate use conditions. Prolonged exposure to sunlight, water and perspiration accelerates ageing. The Casati Milano Atelier provides an 18-month warranty on all manufactured straps, covering construction and stitching defects. Regular maintenance (gentle cleaning with a damp cloth) significantly extends useful life.

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