Strap for Master Collection Date 29 Stainless Steel

The lug width of the Longines Master Collection L2.257.4.78.3 is 15mm. This dimension is specific to the model and must be measured precisely between the two attachment pins using a digital calliper. Accurate measurement is essential to ensure correct and secure strap installation.

The best strap depends on intended use: alligator is the most elegant and formal choice, with a fine grain that dialogues with the guillochéed dial. Vegetable-tanned calf offers versatility and develops a rich patina over time. Vulcanised FKM rubber is ideal for daily wear. What matters is selecting a strap specifically constructed for the 15mm lug width to avoid anomalous gaps or pressure.

Strap replacement is achieved by extracting the attachment pins (spring bars). Use a precision spring bar tool or dedicated implement to gently compress the internal spring, remove the old strap and insert the new one by sliding the pin into the new lug. Ensure the spring is correctly seated on both sides. Alternatively, Casati Milano atelier handles installation by appointment using professional tools.

No, this is not recommended. A 16mm strap will create visible and functional gaps between the lug and strap, compromising aesthetics and stability. Furthermore, the pin may exert irregular pressure. It is essential to use straps constructed precisely for the 15mm lug width, such as those available in the Milano Straps catalogue.

Duration depends on leather quality and intensity of use. An alligator strap with vegetable tanning typically lasts 3–5 years under moderate formal use, with possible extensions if properly maintained (avoid moisture, do not flex excessively). Waxed leather is more resistant to wear. Milano Straps leather straps offer an 18-month warranty. Periodic replacement is a natural part of owning a quality timepiece.