Strap for La Grande Classique Automatic 38 Stainless Steel / White - Roman / Bracelet

The lug width of the Longines La Grande Classique L4.918.4.11.6 is 20 millimetres. This dimension is precise and admits no tolerances: a 19mm or 21mm strap will not fit correctly. You can verify this yourself by placing a digital calliper between the inner edges of the watch lugs.

We recommend genuine alligator (Crocodylus niloticus) with natural patina development, which enhances the case's classical elegance. Alternatively, vegetable-tanned calf leather offers pronounced ageing characteristics. For sporting use or humid climates, shell cordovan provides structural robustness and natural lustre without frequent maintenance.

Use a spring bar tool or visit a qualified watchmaker. Place the watch on a soft surface to avoid scratching. Locate the spring bars beneath the lugs, press gently towards the opposite side to release the lug, remove the old strap and insert the new one, aligning the holes with the springs. Verify secure fitment before wearing.

An original Longines strap guarantees perfect tolerance and factory-identical finishing. A high-quality third-party strap (such as genuine alligator or shell cordovan from specialised ateliers) offers greater aesthetic personalisation, material selection, and often superior construction longevity. Compatibility remains unchanged: the lug width is 20mm in both cases.

A quality leather strap (alligator, calf, shell cordovan) lasts approximately 3–5 years with regular daily wear, provided minimal maintenance is observed (avoid submersion, dry after perspiration or rain exposure, apply conditioner 2–3 times yearly). Shell cordovan and alligator frequently exceed five years. Patina development over time is an aesthetic advantage.