Strap for Master Collection Date 36 Two Tone Black DIamond

The lug width of the Longines Master Collection L2.518.5.57.7 is 19 mm. This dimension corresponds to the internal width between the two attachment points of the case and is standard for all Master Collection models with a 36 mm case. It is essential to respect this measurement when purchasing an aftermarket strap, as any different width would result in visual misalignment and potential fastening issues with the pin system.

For the L2.518.5.57.7, we primarily recommend African alligator leather with medium-tight grain in dark brown or black tones, which reflects the watch's sober identity. Alternatively, equine shell cordovan offers superior mechanical resistance and a natural curve that adheres perfectly to the wrist. Vegetable-tanned calf leather represents an elegant compromise for informal contexts, whilst NATO nylon in neutral colours (grey, beige, black) reinterprets the Master Collection in a contemporary manner. We advise against textures with very coarse grain, which would appear visually disproportionate to the 36 mm case.

Strap replacement uses the spring bar system: position the watch on a soft surface (linen cloth), use a spring bar tool with smoothed ends to gently compress the bar, then extract the used strap from the case's lugs. Repeat on the other side. To install the new 19 mm strap, insert the spring bar into the lug, gently compress with the tool to create space, and slide the new strap until you feel the bar lock into place. Verify that the strap is aligned perpendicular to the case and does not twist. This operation requires patience and care to avoid scratches on the case.

A strap is compatible with the L2.518.5.57.7 if it features an internal width (lug width) of exactly 19 mm. Any strap conforming to this dimension, regardless of material (alligator, calf, shell cordovan, rubber, textile), can be installed on your case without modifications. Compatibility can be verified by consulting your watch's manual or measuring directly with a digital calliper. At milanostraps.it you will find a complete selection of 19 mm compatible straps, customisable in length, initials, and stitching type.

The lifespan of a natural leather strap depends on the material quality and usage conditions. A premium-grade alligator or shell cordovan strap, with professional tanning, maintains structural integrity for 3 to 7 years with routine care (light cleaning, drying after moisture exposure). Vegetable-tanned calf leather, being more delicate, typically shows wear signs after 2 to 4 years. Longevity is accelerated by direct sunlight exposure, frequent wear, sweat contact, and humidity. At Casati Milano, every handcrafted strap is guaranteed for 18 months against manufacturing defects, though actual lifespan can significantly exceed this period with proper maintenance.