Strap for Master Collection 42 24h Stainless Steel / Silver-Arabic / Alligator XL

The Longines Master Collection L2.718.4.70.5 features a lug width of 21 millimetres. This measurement is specific to this model and requires dedicated artisanal straps, as standard aftermarket straps typically cover 20mm or 22mm widths. To verify the measurement accurately, use a digital calliper at the base of the upper lug attachment point, where the strap sits on the pins.

Strap selection depends on your use case and personal aesthetic. For formal contexts, dark brown alligator delivers pure elegance with excellent patina development. For daily sport wear, vegetable-tanned calf offers suppleness and controlled patina. For high-wear environments, textured rubber or NATO provide robust, contemporary solutions. With a blue dial, we recommend grey rubber or blue NATO; with a light grey dial, brown alligator or cognac calf.

Strap replacement requires extraction of the lateral pins from the case. Position the watch on a soft surface (microfibre cloth), locate the pins at lug height, and use an extraction tool (or gentle hammer) to push the pin in the opposite direction until fully released. Repeat on the other side. Insert the new 21mm strap by aligning the holes with the pin seats, then reinsert the pins until fully locked. If you lack the tools, consult a specialist watchmaker or Casati Milano atelier for professional installation.

Yes, any artisanal strap with a 21mm lug width is compatible with the Master Collection L2.718.4.70.5, provided it is manufactured with precise tolerances (standard pins of 1.8mm diameter). Online, milanostraps.it offers a complete collection of 21mm straps customisable in material, colour, length and stitching details. For ultra-personalised configurations, Casati Milano atelier creates exclusive bespoke straps with direct consultation.

A high-quality artisanal leather strap (alligator, calf, shell cordovan) mounted on a Master Collection L2.718.4.70.5 has an average lifespan of 4-7 years in moderate daily use, varying based on climate, personal perspiration, and maintenance. Vegetable tanning offers superior longevity compared to industrial tanning methods. Natural deterioration begins with edge thinning and micro-cracks in the leather; replacement is advised at this point. The patina developed during this period increases aesthetic depth. To extend lifespan, avoid prolonged exposure to humidity, direct sunlight, and excessive perspiration; alternate use with other straps of the same 21mm lug width to distribute wear.