Strap for Master Collection Date 25.5 Stainless Steel / Black - Roman / Bracelet

The lug width of the Longines Master Collection L2.128.4.51.6 is exactly 13mm. This precise measurement requires specifically dimensioned straps for this case: adapting 14mm or 15mm straps would compromise the proper fit and visual proportions of the watch.

For the Longines Master Collection L2.128.4.51.6, alligator leather is the ideal choice, offering a fine grain and natural flexibility that enhances the delicate case proportions. Alternatively, vegetable-tanned calf leather develops an elegant patina over time, whilst shell cordovan combines durability with natural lustre. Synthetic materials are not recommended, as they would undermine the watch's constructive identity.

To change the strap, use a spring bar tool positioned perpendicular to the lug. Press gently inward toward the case to release the spring blade, then extract the bar outward and remove the current strap. Repeat on the opposite lug. Insertion of the new 13mm strap follows the reverse procedure: ensure the spring blade is firmly seated and the strap does not shift laterally.

Yes, quality aftermarket straps offer an excellent option for varying the watch's aesthetic. It is essential to verify that the lug width is precisely 13mm and that the material quality is consistent with the watch's prestige. Milano Straps offers artisanal straps in fine leather, customizable in dimensions and details, specifically compatible with this reference.

A quality artisanal leather strap has an average lifespan of 3–5 years with daily wear and appropriate maintenance. Humidity exposure, perspiration pH, and frequency of use condition ageing. Vegetable-tanned leather develops a natural patina and may last longer; alligator, due to fibre compactness, offers superior resistance. Milano Straps provides an 18-month guarantee on bespoke straps created in-atelier.