Longines · La Grande Classique

Strap for La Grande Classique Automatic 38 Stainless Steel / Grey - Roman

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter38 mm
ReferenceL4.918.4.51.2 (aka: L49184512)
FamilyLa Grande Classique
MovementLongines caliber L591 hours, minutes
Year2021
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the La Grande Classique L4.918.4.51.2 (aka: L49184512)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The La Grande Classique L4.918.4.51.2 (aka: L49184512), seen from the bench

The Longines La Grande Classique L4.918.4.51.2 is a 38 mm stainless steel dress watch with a silver sunburst dial, manual-wind caliber L591 movement, and 20 mm lug width. This model embodies early 20th-century Swiss watchmaking tradition, featuring a minimalist design with applied hour markers and dauphine hands. The case combines satin and polished finishing, while a sapphire crystal with anti-reflective coating protects the dial. Part of the La Grande Classique collection, it represents understated luxury without complications.

Frequently asked questions

What is the lug width of the Longines La Grande Classique L4.918.4.51.2?

The lug width of this model is 20 millimetres. This measurement is taken between the two lugs of the case and determines compatibility with aftermarket straps. It is important to measure accurately using a digital calliper positioned perpendicular to the case lugs to ensure precision.

Which strap is best suited to the Longines La Grande Classique L4.918.4.51.2?

Given the formal character of this Swiss dress watch, a dark brown or black alligator strap represents the most harmonious choice, enhancing the silver dial through chromatic contrast. For a more contemporary aesthetic, vegetable-tanned leather or natural shell cordovan offer temporal evolution of patina. A navy NATO ribbon is ideal for casual pairings without compromising elegance.

How do I change the strap on the Longines La Grande Classique L4.918.4.51.2?

The process requires extraction of the spring bars from the case lugs using a specialist tool. Positioning the watch on a stable support, compress the internal spring of the bar and extract it from its seat. Subsequently, insert the new strap by aligning the lugs to the case holes and reposition the spring bar until it clicks. If unfamiliar with the procedure, a specialist atelier will complete the operation in minutes.

Can I use compatible aftermarket straps on the Longines L4.918.4.51.2?

Yes, absolutely. Any strap with a 20-millimetre lug width is geometrically compatible. The choice of artisanal quality—premium leathers, Italian stitching, refined finishes—amplifies the aesthetic value of the watch without altering its structural integrity. Choose ateliers that guarantee conformity to technical specifications and offer custom personalisation.

How long does a leather strap last?

Longevity depends on material and usage. A quality alligator strap lasts 3–5 years with ordinary maintenance (cleaning, annual conditioning). Shell cordovan, thanks to its superior protein density, can last 5–7 years or beyond. Calf and other delicate leathers require more careful attention, typically lasting 2–4 years. Humid climates and perspiration accelerate ageing. A specialist atelier offers reconditioning services that extend the strap's 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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only