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Longines · Flagship

Strap for Flagship 30 Stainless Steel - Pink Gold / Grey / 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
ReferenceL4.374.3.78.7
FamilyFlagship
MovementLongines caliber L592.5 hours, minutes, seconds | date | chronometer
Year2022
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 L4.374.3.78.7, seen from the bench

The Flagship represents one of Longines' historic collections, characterized by classic and elegant lines. It features the L592.5 caliber with hour, minute, second, date functions and chronometer certification. The case has 15mm lugs and reference L4.374.3.78.7.

Frequently asked questions

What is the lug width of the Longines Flagship L4.374.3.78.7?

The Longines Flagship L4.374.3.78.7 features a 15mm lug width, a non-standard measurement requiring purpose-built straps. To verify, measure from the centre of one lug to the other using a ruler or calliper.

What is the best strap for the Longines Flagship L4.374.3.78.7?

For this 30mm dress watch, we recommend vegetable-tanned alligator with fine grain, or shell cordovan for superior longevity and accelerated patina. Both enhance the satinised silver dial of the Flagship without compromise.

How do I change the strap on the Longines Flagship L4.374.3.78.7?

Use a spring bar removal tool (pressing the small metal release button) whilst supporting the strap. Insert the new strap, aligning it with the 15mm lugs. If uncertain, consult a trusted watchmaker to prevent damage.

Can I use an aftermarket strap on the Longines Flagship L4.374.3.78.7?

Yes, provided the lug width is precisely 15mm. Straps of 14mm or 16mm will cause visual and functional misalignment. Milano Straps offers artisanal straps compatible with this model, customisable in leather and colour.

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

An artisanal strap in alligator or shell cordovan, with ordinary care, maintains functionality and aesthetics for 3–5 years. Natural patina improves over time. Shorter lifespan (2–3 years) for Taurillon calf. Controlled ageing is a quality characteristic, not a defect.

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