Longines
La Grande Classique L4.918.4.11.2— lug 20mm

The lug width of the L4.918.4.11.2 is 20 millimetres. This is measured from the outer edge of the first lug to the outer edge of the second lug, ensuring that any replacement strap is compatible with this specific dimension. Straps of 18 or 22 millimetres would create irregular gaps and compromise fit on the case.

Black or brown alligator fully expresses its classical character; vegetable-tanned calf maintains minimalist lines; cotton-linen NATO offers informal versatility. All are compatible with the stainless steel case. Choice depends on primary use: alligator for formal, calf for daily wear, NATO for weekends.

Insert a spring bar removal tool into the lateral holes of the lug to extract the pin supporting the strap. Remove the old strap and thread the new one through the lug holes, ensuring the pin is securely fastened and the strap is centred under the case. This process takes approximately 2–3 minutes with practice.

Yes, provided it is made to fit a 20-millimetre lug width. Bespoke straps in alligator, vegetable-tanned calf, or shell cordovan from specialist suppliers guarantee total compatibility and often exceed factory strap quality. Always verify lug width before purchase.

A high-quality alligator or calf strap lasts 3 to 5 years with daily wear, developing a noble patina. Longevity depends on exposure to moisture, heat, and friction. A vegetable-tanned strap ages more visibly but maintains structural resilience. An 18-month warranty is standard for specialist artisans.