Longines · La Grande Classique

Strap for La Grande Classique Tonneau 30 Stainless Steel

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

Lug width18 mm
Case diameter30 mm
ReferenceL4.705.4.58.6 (aka: L47054586)
FamilyLa Grande Classique
MovementLongines caliber L209 hours, minutes
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 L4.705.4.58.6 (aka: L47054586)

Selected for the 18 mm lug width

All 18 mm straps →

The La Grande Classique L4.705.4.58.6 (aka: L47054586), seen from the bench

La Grande Classique represents Longines' line of elegant watches characterized by essential lines and a slim profile. The model mounts the L209 quartz caliber with hour and minute indication. The lugs measure 18mm in width.

Frequently asked questions

What is the lug width of the Longines La Grande Classique L4.705.4.58.6?

The lug width is 18 mm. This dimension represents the distance between the two lateral lugs where the strap attaches to the case. Accurate measurement is essential: use a digital calliper positioned between the lugs at their innermost point to verify the exact 18 mm specification. Any strap of different width (20 mm or 16 mm) will not fit properly.

Which strap material is most suitable for the Longines La Grande Classique L4.705.4.58.6?

Alligator leather with vegetable tanning represents the ultimate in elegance: the natural grain pattern engages harmoniously with the watch's proportional purity. As an alternative, fine-grained calf leather offers versatility and resilience, whilst shell cordovan provides refined organic lustre. For a contemporary approach, technical NATO fabric in neutral tones (grey, navy blue) maintains visual minimalism. Vulcanised rubber represents the most functional option for humid environments.

How do I change the strap on a watch with 18 mm lugs?

The procedure requires a specialised tool (spring bar removal tool or watchmaker's hammer with dedicated tips). Position the watch on a soft mat with the case facing upward. Identify the direction of the spring bar pin (typically downward): using the tool, apply gradual outward pressure to release it. Once freed, extract the strap. Insert the new strap through the lug and repeat the operation from the opposite side. Many prefer professional assistance from a watchmaker to avoid case damage.

Can I use an aftermarket strap on this Longines?

Yes, provided the lug width is precisely 18 mm. Quality aftermarket straps guarantee compatibility and often superior aesthetic versatility compared to originals. Verify that the strap features compatible buckle design (symmetrical for women's watches) and that length is adjustable for small to medium wrists. Artisanal straps with vegetable tanning age magnificently, developing natural patina over time and extending the watch's aesthetic narrative.

How long does a leather strap last on a frequently worn watch?

Durability depends on material quality, thickness, and environmental exposure. A high-quality alligator or calf leather strap, worn daily with moderate humidity exposure, maintains structural integrity for 2-4 years. Vegetable tanning favours natural patina development that visually documents elapsed time, enhancing aesthetic value. Very humid environments (swimming pools, saltwater) reduce lifespan. Well-maintained straps (dried after perspiration, stored in dry conditions) can exceed 5 years. Artisanal double-layer straps develop robustness through natural leather ageing.

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