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Longines · Flagship

Strap for Flagship 30 Stainless Steel - Yellow Gold / White - Diamond / Bracelet

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

Lug width

15mm
15 mm strapsAll Longines
Lug width15 mm
Case diameter30 mm
ReferenceL4.374.3.27.7
FamilyFlagship
MovementLongines caliber L592.5 hours, minutes, seconds | date | chronometer
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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The Flagship L4.374.3.27.7, seen from the bench

The Longines Flagship L4.374.3.27.7 is the contemporary evolution of an icon introduced in 1957, embodying classic Swiss watchmaking. This 30mm stainless steel case model maintains the original feminine and unisex philosophy with harmonious proportions and discrete elegance. The watch is equipped with the Longines L592.5 automatic caliber, COSC Chronometer certified, offering precision of -4/+6 seconds per day. It features hours, minutes, seconds and date indication, with sapphire crystal and exhibition caseback. Water-resistant to 30 meters, the 15mm lug width is specifically designed for the compact proportions of this 30mm diameter case.

Frequently asked questions

What is the lug width of the Longines Flagship L4.374.3.27.7?

The Longines Flagship L4.374.3.27.7 at 30mm features a lug width of 15mm, an unconventional specification that preserves the harmonious proportions of this compact model. This reduced dimension is constructive for the case diameter and requires dedicated straps to ensure optimal fit without lateral overhang.

Which strap should I choose for the Longines Flagship L4.374.3.27.7?

For the 30mm Flagship we recommend alligator in black or dark brown for the most classical elegant formula, or Italian calf with vegetable tanning for everyday versatility. Shell cordovan offers superior chromatic complexity with reflections that evolve over time. For casual wear, FKM rubber straps will maintain aesthetic coherence with the watch's delicate proportions.

How do I change the strap on the Longines Flagship L4.374.3.27.7?

Strap replacement requires removal of the anchor pins (spring bars) from the lugs using a dedicated tool or thin screwdriver. Position the watch with lugs facing upward, gently compress the internal spring of the pin and slide it out from its seat. Repeat for both lugs, then insert the new strap aligning it with the internal lug shoulders.

Which aftermarket straps are compatible with the Longines Flagship L4.374.3.27.7?

Any commercially available strap with a 15mm lug width is compatible with the Flagship L4.374.3.27.7. On milanostraps.it you will find a selection of artisanal 15mm straps made in alligator, calf, shell cordovan and rubber, customisable in length, colour and constructive details.

How long does a leather strap last on the Longines Flagship L4.374.3.27.7?

A quality leather strap, properly maintained, lasts on average 3-5 years with daily use. Longevity depends on frequency of use, exposure to moisture and tanning quality. Vegetable-tanned leather develops a protective patina that extends useful life. Casati Milano straps include an 18-month warranty and can be renewed with only the lugs bent, preserving the original buckle.

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