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

The lug width of the Longines Master Collection L2.128.4.51.7 is precisely 13 millimetres, an extraordinarily rare and specific dimension. This width is determined by the 25.50mm case proportions and ensures the aesthetic harmony of the design. Always verify the lug width before purchasing an aftermarket strap to avoid incompatibility issues.

For this dress watch, we recommend noble leathers such as alligator or vegetable-tanned calf, in sober colours (dark brown, black, burgundy) that respect the case elegance. Alligator is the ideal choice for its natural texture and evolving patina over time. NATO straps represent a versatile alternative in grey or beige tones. Rubber straps are discouraged as they would appear disproportionate on this lug width.

Strap replacement is straightforward: use a spring bar tool positioned horizontally beneath the lug on the case interior. Apply light pressure to release the retention spring, then extract the spring bar. Repeat on the opposite lug. Insert the new strap, aligning the lug with the watch lugs, then press gently until the retention click engages. Execute with care to avoid scratching the steel case.

Yes, provided the lug width is exactly 13mm as required by this model. Quality aftermarket straps offer the same structural reliability as genuine Longines straps. Always verify lug width compliance and construction quality: irregular stitching or a poorly welded deployante compromises user experience. Bespoke artisanal straps offer the additional advantage of personalisation (initials, thread colour, leather selection).

Leather strap durability depends on daily use and construction quality. High-quality alligator or vegetable-tanned calf typically lasts 3-5 years with regular wear, longer if alternated with replacement straps. Vegetable-tanned leather develops a fascinating patina that characterises ageing. Factors reducing durability: constant perspiration and humidity, cosmetic contact, frequent rain exposure. A bespoke artisanal strap with an 18-month warranty provides peace of mind.