Strap for Master Collection 40 Date Stainless Steel / Pink Gold / Silver-Diamond / Bracelet

The lug width of the Longines Master Collection L2.793.5.77.7 is 21mm. This measurement is critical when selecting a compatible strap: it represents the distance between the lugs at the point of strap insertion. When measured with callipers between the strap holes, the value must correspond exactly to 21mm to ensure a precise fit without slack or tightness.

For the Master Collection L2.793.5.77.7, straps in alligator or vegetable-tanned calf leather are recommended. Alligator is the classic choice that complements the pink gold case with natural texture and evolving patina. Vegetable-tanned calf offers solidity and develops a fascinating patina over time. For sportier use, shell cordovan guarantees durability and minimalist aesthetics. The choice depends on usage: alligator for formal/elegant occasions, calf for versatile wear, shell cordovan for robust and sporty applications.

Strap replacement is accomplished through the bayonet-type attachments (spring bars) that connect the strap to the case lugs. A specific tool (strap removal tool) is required to extract the spring bars from their housings. Place the watch on a soft surface, insert the tool into the spring bar groove until it retracts, remove the old strap, align the new strap holes with the spring bars, and reinsert the springs. This operation is best entrusted to an experienced watchmaker to avoid damage to the lugs.

Yes, any strap with a lug width of 21mm is compatible with the Longines Master Collection L2.793.5.77.7. It is essential that the measurement corresponds exactly: 20mm or 22mm straps will not provide a correct fit. High-quality artisanal aftermarket straps offer a variety of leathers, textures, and colours not available in the official Longines catalogue, allowing customisation without compromising mechanical compatibility.

The durability of a natural leather strap depends on usage, storage, and type of tanning. On average, a high-quality artisanal strap in alligator or vegetable-tanned calf maintains structural and aesthetic integrity for 3–5 years of daily wear. Prolonged exposure to moisture, direct sunlight, and heat accelerates wear. The patina that develops is normal and sought-after, while stitching failure or buckle breakage signal the need for replacement. Atelier Casati Milano provides an 18-month warranty on custom straps, covering manufacturing defects.