Strap for La Grande Classique Automatic 25 Stainless Steel / Yellow Gold PVD / Champagne

The Longines La Grande Classique L4.398.3.37.7 features a lug width of 13 millimetres. This dimension is specific to Longines' feminine models of this generation and was chosen to ensure harmonious proportions with the 25-millimetre case diameter. Measurement is performed by placing a calliper on the inner lug shoulder, from the upper point to the lower point where the strap attaches to the case.

For the Longines La Grande Classique L4.398.3.37.7, several options are recommended depending on usage: alligator in dark tones (black, brown, blue) for formal occasions, premium vegetable-tanned leather for everyday elegance with an evolving patina, and rubber for sporty contexts and versatility. Each material must respect the 13-millimetre lug width to ensure perfect case adherence.

Strap replacement is accomplished via the spring bar—a small metal pin running through the lug. Using a spring bar tool, apply gentle pressure to compress the spring and extract the pin from the case slots. Once the old strap is removed, align the new strap's slots with the lug shoulders and reinsert the spring bar. Alternatively, entrust the task to an authorised Longines service centre or specialist watchmaker.

Yes, aftermarket straps of artisanal quality are fully compatible with the Longines L4.398.3.37.7, provided they strictly adhere to the 13-millimetre lug width specification. Specialist brands in custom straps, such as those offered by Milano Straps, guarantee premium materials—alligator, vegetable-tanned calf, shell cordovan—and construction methods that preserve case integrity. Using aftermarket straps does not affect the movement warranty.

Strap longevity depends on material and usage patterns. Premium calf or alligator, worn daily under normal conditions (without prolonged exposure to extreme humidity or intense perspiration), typically lasts 3 to 5 years. Vegetable-tanned leather tends to endure longer than industrially processed alternatives. Wear is natural and desirable: creasing and patina development tell the strap's personal story. To extend lifespan, rotate between multiple straps and allow the strap to dry completely after humid exposure.