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

The lug width of the Longines Master Collection L2.128.4.51.3 is 13 mm. This is the distance between the two lateral lugs of the case where the strap attaches. It is the determining technical parameter for compatibility: always verify this measurement with a digital calliper before purchasing an aftermarket strap.

For the Master Collection L2.128.4.51.3, we recommend alligator or vegetable-tanned calf leather in colours such as warm brown, deep black, or burgundy. Alligator offers regular grain and natural patina development over time; vegetable-tanned calf guarantees authentic softness and colour development. Avoid sporty materials: the model's DNA requires a strap that emphasises urban elegance.

The strap is changed by removing the spring bars that connect the strap to the case lugs. You will need a dedicated tool (spring bar tool) or a small flathead screwdriver. Position the tool vertically beneath the spring bar, apply gentle pressure and the bar will retract, allowing you to extract the strap. Align the new strap's holes with the lugs and allow the spring bar to click into position. If uncertain, consult a professional watchmaker.

Yes, any strap with a 13 mm lug width is compatible with the L2.128.4.51.3. Artisanal aftermarket straps often offer superior quality to OEM Longines models, with carefully selected leather and customisable finishes. Ensure the strap is made by experienced craftsmen and that the thickness is suitable for the weight of the steel case (typically 1.4–1.6 mm total leather thickness).

The lifespan of a leather strap depends on the material, frequency of wear and care. Quality calf leather lasts 2–3 years with daily wear; alligator or shell cordovan reach 5–7 years or beyond. Vegetable-tanned leather develops character in the first year, then maintains stability. Avoid prolonged moisture, direct heat and excessive perspiration. Proper storage (gentle drying, no prolonged water contact) significantly extends strap life.