Strap for La Grande Classique Tonneau 35 Diamond

The lug width is 20 mm. This measurement represents the internal space between the case lugs. On a 35 mm diameter model, this dimension ensures perfectly balanced proportions and allows the use of straps specifically engineered for this width.

An alligator with traditional tanning or a calf leather with vegetable tanning are the most recommended choices. Alligator accentuates the austere aesthetic of the steel case; calf leather ages organically, developing a patina that develops alongside its owner. Both honour the minimalist character of the watch.

Position the watch with the lugs facing upward. Use a spring bar tool to gently compress the pin from below, creating sufficient space to extract the old strap. Insert the new strap ensuring the pins fully engage in the lugs, then release the tool. Verify that the strap is secured evenly on both sides.

Any strap engineered with a 20 mm lug width is compatible. Specialist artisan manufacturers produce fully customisable straps in length, material, thickness and colour. We recommend contacting producers familiar with Longines Heritage standards to ensure complete aesthetic coherence.

A premium quality strap, with alligator or calf leather of appropriate thickness (1.4–1.6 mm), has an average lifespan of 5–7 years with daily use. Longevity depends on sun exposure, humidity, perspiration and maintenance. Vegetable-tanned leather ages better, developing protective patina over time.