Longines · Flagship

Strap for Flagship 35.6 Automatic Two Tone Champagne Diamond

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter36 mm
ReferenceL4.774.3.37.7 (aka: L47743377)
FamilyFlagship
MovementLongines caliber L619.2 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 Flagship L4.774.3.37.7 (aka: L47743377), seen from the bench

The Longines Flagship L4.774.3.37.7 is a 35.60 mm automatic watch with Two Tone Champagne Diamond design and an 18 mm lug width. It features the Longines L619.2 quartz movement displaying hours, minutes, seconds, and date window. The case is satin-finished stainless steel with a three-body construction and smooth bezel, designed for refined legibility without unnecessary decoration.

Frequently asked questions

What is the lug width of the Longines Flagship L4.774.3.37.7?

The lug width is 18 mm. This width is specific to this generation of Flagship and represents a rare standard in contemporary collections. To verify compatibility, remove the original strap and measure the thickness of the lug bar in the lateral slots of the case. Straps narrower than 16 mm or wider than 20 mm will not fit correctly.

Which strap is best for the Longines Flagship L4.774.3.37.7?

The choice depends on use case and dial tone. Medium brown alligator remains the classic option: it offers wear resistance, marked natural grain, and patina that develops over time. For casual wear, European calf with vegetable tanning guarantees authentic ageing. For extreme versatility, a technical canvas NATO strap, or for formal occasions, burgundy shell cordovan, transforms the Flagship into an evening timepiece.

How do you change the strap on the Longines Flagship L4.774.3.37.7?

Remove the watch from your wrist. Locate the two lateral slots on the case where the lug bar rests. Using a spring bar tool or fine needle, compress the spring inside the slot, sliding the lug bar downward. Repeat on the other side. Insert the new strap by sliding one lug bar into the upper slot, compress the spring, and insert the second lug bar. Verify that both sides are perfectly seated.

Are aftermarket straps compatible with the Longines Flagship L4.774.3.37.7?

Yes, provided the lug width is exactly 18 mm. Artisanal custom straps are an excellent choice for this model, allowing you to select materials (alligator, calf, cordovan, NATO) and finishes (colours, stitching thread, initial patina) according to personal preference. Always verify that the strap is fitted with a quality deployant clasp or traditional ardillon buckle to ensure safety and durability.

How long does a leather strap last on the Longines Flagship L4.774.3.37.7?

Durability depends on material and use. A superior quality alligator strap, worn daily but with acceptable care, lasts 4–6 years before replacement. Vegetable-tanned calf may last 3–5 years with visible but structural ageing. Shell cordovan, being a noble material, resists 6–8 years with an ageing that makes it more precious. Critical factors: keep the strap dry, avoid prolonged contact with sweat and fresh water, and rotate multiple straps if possible to distribute wear.

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