Strap for La Grande Classique 29 Stainless Steel - Diamond / Blue

The lug width of the Longines La Grande Classique L4.523.0.90.2 is 16 millimetres. This measurement represents the internal distance between the two lugs of the case. To verify it, place a digital calliper perpendicular to the lugs, measuring the internal distance from one lug to the other. Precise measurement is essential before purchasing an aftermarket strap, as 15mm and 17mm formats are not compatible.

We recommend fine-grained alligator, vegetable-tanned calf leather, or high-quality synthetic rubber for this model. Alligator enhances the minimalist elegance of the ultra-thin case; calf leather offers everyday versatility; rubber allows for casual and sports use. Your choice depends on your style and intended usage, always prioritising artisanal quality.

Changing the strap requires a spring bar tool. Position the watch in a stable holder, insert the tool tip into the hole beneath each lug, then push downward: the lug will retract into the case. Remove the old strap and insert the new one, ensuring the lugs lock correctly at the opposite ends of the case. If you lack experience, we recommend consulting a professional watchmaker.

Any strap with a 16mm lug width is compatible with the L4.523.0.90.2. MilanoStraps offers online a selection of 16mm artisanal leather straps, customisable in sizes, initials and stitching thread. For a bespoke experience, the Casati Milano atelier produces custom straps with personal leather selection and an 18-month warranty.

Lifespan depends on leather quality and intensity of use. An excellent-quality alligator or calf strap, used daily, has a useful life of 3–5 years before replacement is necessary. Lower-quality leathers may deteriorate within 1–2 years. To extend lifespan, avoid prolonged exposure to moisture and direct sunlight. Casati Milano atelier provides an 18-month warranty on all straps produced.