Strap for La Grande Classique 37 Quartz Diamond Bezel Heart MOP

The lug width of the Longines La Grande Classique L4.770.0.09.4 is precisely 20mm. This measurement represents the distance between the two mounting points on the case where the strap attaches. It is essential to verify this dimension before purchasing an aftermarket strap to ensure perfect compatibility and balanced proportions on the wrist.

For the Longines La Grande Classique L4.770.0.09.4, we recommend polished alligator in black or dark brown for formal wear, or vegetable-tanned calf for those seeking a strap with greater character and ageing capability. A NATO fabric strap offers daily versatility. Your choice depends on usage: formal occasions call for alligator or refined calf, whilst casual elegance interprets well with NATO or quality rubber.

The strap is replaced by removing the spring bars from the case lugs. Use a dedicated tool (spring bar remover) to depress the internal spring and extract it gently. Position the new strap, align the holes, and snap the spring bars back into place. This operation requires precision: if you are unfamiliar with the process, entrust the task to a professional watchmaker or our Casati Milano atelier.

Yes, any strap designed for 20mm lug width is compatible with the Longines L4.770.0.09.4. Our artisanal straps from milanostraps.it are crafted from authentic leather and available with integrated deployante buckle, guaranteeing superior quality and aesthetics in keeping with Longines tradition.

A high-quality leather strap (alligator, calf, shell cordovan) has an average lifespan of 4–6 years with daily wear, extending to 8 years with mindful maintenance. Durability depends on the tanning method, frequency of use, and exposure to moisture and perspiration. Our artisanal straps include an 18-month warranty and can be refurbished or replaced at the Casati Milano atelier at advantageous rates.