Strap for Master Collection Date 36 Black Diamond / Bracelet

The lug width of the Longines Master Collection L2.518.4.57.6 is 19 millimetres. This measurement is specific to the 36 mm case model and results from precise proportional calculation that guarantees visual equilibrium between the case and strap. It is essential to verify that any purchased strap has exactly this width to avoid unwanted gaps between the strap and the case lugs.

For the Longines Master Collection L2.518.4.57.6, the ideal strap depends on intended use. Alligator leather in dark brown or bordeaux tones offers uncompromising elegance; vegetable-tanned calf develops a patina that parallels case aging; cotton canvas NATO maintains casual versatility; vulcanised rubber represents the modern choice for those unafraid to be bold. The final selection remains a personal decision based on wearing context.

Strap removal is accomplished using a specific tool called a 'spring bar tool' or lug pin remover. Locate the two case lugs, position the lever in the small space beneath each lug to compress the internal spring (spring bar), then extract the strap with a decisive movement. Installing the new strap follows the reverse procedure: align the strap with the lugs and allow the spring to re-engage automatically into its retention position.

Yes, you may use aftermarket straps provided they are specifically constructed for a 19 mm lug width. Artisan-made straps of superior quality, such as those crafted by Casati Milano or other specialised manufactures, often offer materials and finishes that exceed OEM standards. It is advisable to select suppliers who comprehend your watch's aesthetic identity and who can personalise the strap according to your colour and construction preferences.

The lifespan of a leather strap varies depending on material, usage frequency and environment. Alligator or shell cordovan, if maintained correctly, last 5-8 years of daily use. Vegetable-tanned calf may last 3-5 years before showing significant wear signs. Regular maintenance with leather-specific conditioning creams and prompt drying after moisture exposure can substantially extend strap lifespan.