Strap for La Grande Classique Tonneau 35 Stainless Steel

The lug width of the Longines La Grande Classique L4.786.4.87.6 is 20mm. This measurement, taken between the inner edges of the attachment pins, is precise and allows no tolerance. Any strap must measure exactly 20mm in width to fit correctly without lateral play. If the strap is too narrow or too wide, it will create instability on the wrist and risks damaging both the case and the strap.

The ideal material depends on your intended use. Alligator leather in black or dark brown is the most sophisticated choice, perfect for formal business and ceremonial occasions. Vegetable-tanned calf leather develops a natural patina with age, telling the story of your wear. A NATO fabric strap maintains reduced thickness and adds versatility for informal contexts. For summer, rubber or shell cordovan provide comfort without sacrificing elegance. All these materials are available in 20mm width through milanostraps.it.

Strap replacement is performed by extracting the spring pins from the case lugs. Position the watch on a soft surface to prevent scratches. Using a dedicated spring bar tool, press the pin gently inward and lift the strap at the base of the lug until the pin releases. Repeat on the opposite side. To install the new strap, thread the pin through the strap's strap holes, position one end in the first lug, and press the pin with the tool until you feel it lock. Repeat on the other lug.

Yes, it is fully compatible with quality aftermarket straps, provided the lug width is exactly 20mm. milanostraps.it offers a selection of artisanal straps in alligator, calf leather, shell cordovan and NATO, all available with optimal thicknesses for this reference. The Casati Milano atelier also creates custom straps with personal leather selection and customisation options (initials, stitching colour), ensuring perfect fit and durability up to 18 months.

The lifespan of a leather strap depends on the material and usage. Alligator and calf leather offer average durability of 3–5 years under daily wear conditions. Shell cordovan, being denser, can reach 5–7 years. The natural ageing of vegetable-tanned leather adds character but requires minimal maintenance (occasional cleaning, avoiding standing water). Straps crafted by Casati Milano carry an 18-month guarantee and can be renewed through professional re-stitching, further extending their useful life.