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
ReferenceL3.277.4.76.6 (aka: L32774766)
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 L3.277.4.76.6 (aka: L32774766), seen from the bench

The Longines Conquest L3.277.4.76.6 is a women's watch from the Conquest family, created in 1954 to withstand polar expeditions and diving. It features a 29.5 mm stainless steel 316L case, a blue sunburst dial, and a Longines quartz caliber L250 movement. The 15 mm lug width is a deliberate proportional choice reflecting its compact case size and ergonomic design for the wrist.

Frequently asked questions

What is the lug width of the Longines Conquest L3.277.4.76.6?

The lug width is 15 millimetres, a non-standard measurement smaller than the typical 16, 18 or 20mm found on most watches. To verify this, measure the internal distance between the lugs along the 12-to-6 axis. The spring bar passages are specifically designed to accommodate 15mm straps.

Which strap is recommended for the Conquest L3.277.4.76.6?

Alligator leather in smoke grey or tobacco tones preserves the model's elegant balance. Vegetable-tanned calf develops superior patina and colour evolution over time. For a sportier aesthetic, natural rubber or NATO canvas offer durability and ease of maintenance. The blue sunburst dial pairs naturally with neutral-warm strap tones (cognac brown, slate grey, light beige).

How do I change the strap on the Longines L3.277.4.76.6?

Use a spring bar removal tool to access the lug passages from the caseback. Position the watch on a flat surface and gently press the spring bar inward with a flat implement. Once loosened, remove the strap. To install a new one, insert the spring bars into the lugs and press firmly until they lock into position.

Is the Longines L3.277.4.76.6 compatible with aftermarket 15mm straps?

Yes. Any strap with a 15-millimetre lug width is compatible with this model's spring bar passages. Ensure strap thickness does not exceed 3–3.5mm to avoid excessive tension on the lugs. Bespoke artisanal straps allow customisation in leather choice, length, and details such as initials and stitch colour.

How long does a leather strap last on the Longines Conquest?

A quality vegetable-tanned leather strap typically lasts 3–5 years with daily wear. Longevity depends on humidity exposure, perspiration, UV light and usage frequency. Waxed or oil-treated leathers age more gracefully. Regular maintenance—gentle cleaning with a damp cloth and air drying—significantly extends strap lifespan and enhances patina development.

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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