Strap for La Grande Classique Quartz 36 Stainless Steel / Black - Roman

The lug width of the Longines La Grande Classique L4.755.4.51.2 is 20 millimetres. This measurement represents the internal distance between the two lugs of the case and is critical for strap compatibility. A 20 mm strap inserts without excessive play, maintaining ideal aesthetic proportions and ensuring proper fit to the wrist.

For the Longines L4.755.4.51.2, an alligator strap with vegetable tanning represents the choice of maximum elegance, thanks to its regular grain texture and the patina that develops naturally over time. Alternatively, vegetable-tanned box calf or Hungarian shell cordovan offer constructive solidity and controlled aging. For sporting contexts, a thick-cotton NATO maintains the formal rigour of the reference.

Strap replacement is accomplished by removing the spring bars from the lugs. Using a dedicated tool, one applies gentle pressure towards the dial to release the bar, then extracts it. The new 20 mm strap is positioned by aligning the lateral holes, and the bar is reinserted until it clicks into place. The operation requires care to prevent scratches on the case.

Yes, any 20 mm strap (aftermarket or bespoke) is compatible with the Longines L4.755.4.51.2, provided it is manufactured from materials consistent with the case's proportions. It is advisable to verify that the thickness is between 2.8 and 3.5 mm, and that the aesthetic finish (colour, texture, closure type) respects the reference's sobriety. Atelier Casati Milano offers custom 20 mm straps on request.

The lifespan of a leather strap depends on the material and use. An alligator or vegetable-tanned box calf typically lasts 3–5 years with daily wear. Shell cordovan can exceed 8 years owing to its structural density. The leather should be occasionally cleaned with a damp cloth and protected from prolonged sun exposure. Atelier Casati Milano offers an 18-month warranty and regeneration service.