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

The lug width of the Longines Master Collection L2.718.4.78.5 is 20 millimetres. This measurement is the distance between the two spring bars that connect the strap to the case. To verify this precisely, measure perpendicularly to the crown the distance between the two metal attachment points. A 20mm strap mounts without forcing and ensures correct proportions on this 42mm case.

For the Master Collection L2.718.4.78.5, straps in alligator, shell cordovan or vegetable-tanned calf are ideal. Alligator offers formal elegance and noble patina, cordovan guarantees durability and improves with time, smooth calf permits chromatic range and visible maturation. Choice depends on primary use: alligator for occasions, calf for versatility, cordovan for conscious longevity.

The strap is changed by extracting the spring bars from the case lugs. Use a spring bar tool, gently pushing the small metal button on one bar whilst sliding it outward. Once the first bar is free, repeat with the second. Insert the new 20mm strap keeping the bars straight, ensuring they lock fully in both lugs. This operation requires no specialist tools, only care.

Yes, aftermarket straps can be fitted to this model provided they respect the 20mm lug width. A well-constructed artisanal strap with premium leather and precise stitching integrates with the Master Collection without aesthetic compromise and often enhances the overall tactile experience compared to OEM straps. Choose manufacturers guaranteeing adjustability and certified construction quality.

A quality natural leather strap, if subject to ordinary maintenance (drying after moisture, avoiding acute creases), maintains structural integrity between 3 and 7 years depending on use. Vegetable tanning matures visibly within twelve months. Alligator requires periodic application of balm and fears prolonged humidity. Shell cordovan is the most robust and ages positively for up to ten years. Extreme climatic conditions and frequent immersion significantly reduce durability.