Strap for Master Collection Date 38.5 Black Diamond / Bracelet

The lug width of the Longines Master Collection L2.628.4.57.6 is 20 mm. This measurement is specific to this model and must be strictly observed when selecting an aftermarket strap, as lugs of different widths (19 mm or 21 mm) would create undesirable gaps between the case lugs and the strap.

The optimal strap choice depends on intended use and aesthetic preference. For maximum elegance, we recommend alligator in teak brown or black, or vegetable-tanned calf that ages naturally. For versatility, shell cordovan in brown or a cotton NATO strap offers practicality whilst maintaining coherence with the Master Collection's classical heritage. The ideal chromatic pairing remains warm brown or black against the silvered, brushed dial.

Strap replacement on the L2.628.4.57.6 is performed by removing the pins connecting the strap to the case lugs. A dedicated pin removal tool or a quality spring bar remover is required to prevent scratches. Position the watch with lugs facing downward, gently push the pin from one side until extraction, then repeat for all pins. Insert the new strap, aligning it precisely before reinserting the pins. Professional service through a Longines authorised centre or trusted watchmaker is recommended to ensure precision.

Yes, you may use an aftermarket strap compatible with the 20 mm lug width. Longines places no restrictions on strap replacement; however, we recommend straps constructed to elevated quality standards (alligator, vegetable-tanned calf, shell cordovan) to preserve the aesthetic and constructive coherence of the Master Collection. Always verify that the strap is designed for 20 mm width and that stitching is executed professionally.

Leather strap durability depends on material composition and use intensity. Alligator and shell cordovan with quality vegetable tanning maintain structural integrity for 3-4 years under daily wear. Naturally tanned calf ages visibly but remains functional for 2-3 years if not subjected to constant moisture or extreme thermal variation. Longevity extends significantly if the strap is protected from frequent perspiration, humidity, and environmental extremes. Regular conditioning with natural oils prolongs strap lifespan by several additional months.