Strap for La Grande Classique Quartz 37 Stainless Steel / Black - Roman / Bracelet

The lug width of the Longines La Grande Classique L4.766.4.51.6 is 20 millimetres. This dimension represents the distance between the two holes where the strap attaches to the case. Precise measurement is essential to ensure compatibility, secure attachment, and correct aesthetic proportion relative to the 37mm case diameter.

For the La Grande Classique L4.766.4.51.6, an alligator strap is recommended for formal elegance, or vegetable-tanned calfskin for daily versatility. NATO straps with leather backing are equally suitable for a sportive-elegant style, and structured rubber offers practicality without functional compromise. The choice depends on intended use and personal preference for material feel.

Strap replacement is performed using the spring bar pins. With a dedicated spring bar tool, depress the pin slightly on one side, allowing it to slide out of the hole. The pin is then inserted into the holes of the new strap by repeating the operation. It is important to work over a soft surface to prevent the case from falling. If inexperienced, a specialist atelier such as Casati Milano ensures correct execution without risk.

Yes, any strap with a 20mm lug width is compatible with the L4.766.4.51.6. Quality aftermarket straps (in alligator, calfskin, NATO) fit perfectly with the original suspension pins. Choosing a non-original strap does not affect the watch's warranty and allows great aesthetic and functional flexibility. We recommend selecting specialised manufacturers to ensure durability and finish quality.

A quality leather strap (vegetable-tanned alligator or calfskin) has an average lifespan of 3–5 years with moderate daily use, extendable to 5–7 years with regular maintenance (gentle cleaning, protection from excessive moisture, rotation with other straps). Natural leather ageing is not deterioration but development of aesthetic patina. Upon reaching functional wear, the strap can be replaced whilst retaining the original suspension pins. Casati Milano offers an 18-month warranty on bespoke atelier-made straps.