Louis Erard
Excellence 54230AG59.BDC02— lug 21mm

The lug width is precisely 21.00 mm. This dimension is critical for strap compatibility: when measured with a calliper across the lugs, it must be exactly 21 mm. Even minor variations (±0.2 mm) cause excessive play or abnormal tension on the spring bars, compromising both aesthetics and durability.

For this model's classical-contemporary character, an alligator strap with vegetable tanning or an aniline-dyed calf leather represents the optimal choice: they enhance the case proportions without competing visually. For daily sporty wear, a vulcanised rubber strap maintains versatility and practicality. NATO canvas offers maximum stylistic interchangeability.

Position the watch on a soft cushion with the case facing upward. Using a dedicated spring bar tool, gently push the elastic pin from one direction only until the strap releases. Remove the old strap, insert the new one by aligning both elastic pins, and verify the attachment with light pressure. Never apply excessive force: the pins are delicate components.

Yes, provided they are verified with precision. The lug width of exactly 21.00 mm is essential to avoid mechanical and aesthetic issues. We recommend artisan-crafted straps manufactured with controlled tolerances: the masters at Casati Milano measure every specimen before delivery.

With standard daily wear and correct maintenance (regular cleaning, post-rain drying, protection from prolonged moisture), a quality artisan alligator or calf strap guarantees 4-6 years of service. Longevity depends on exposure to humid climates, sweat pH and intensity of use. Vegetable tanning develops noble patina over time, extending aesthetic appreciation beyond mere function.