Strap for Master Collection 42 24h Stainless Steel / Black-Roman / Alligator

The lug width of the Longines Master Collection L2.718.4.50.7 is precisely 21 mm. This dimension represents the horizontal distance between the two attachment points on the case lugs where the strap connects. It is critical to verify this measurement before purchasing an aftermarket strap, as any dimensional tolerance would result in lateral play or inadequate grip during wear.

Given the sport-elegant nature of the Master Collection L2.718.4.50.7, alligator leather remains the archetypal choice: its scalare grain visually reduces thickness and emphasises the geometric clarity of the case. However, vegetable-tanned calf offers certified longevity with organic patina development over time, whilst shell cordovan presents an intrinsic lustre that dialogues with the satin-finished stainless steel case.

The Master Collection L2.718.4.50.7 is fitted with straight lugs (non-folding). To change the strap, you require a spring bar removal tool: insert the bifurcated tip into the lateral recesses of the spring bar, lift slightly to compress the internal spring, then extract the bar. Once free, the strap slides away easily. The reverse operation mounts the new strap: position the new leather so that the lug ends align with the holes, then reinsert the compressed spring bar until the retention click engages. If you do not possess the tool, professional assistance is advisable to avoid case scratching.

Yes, any strap with a certified 21 mm lug width is compatible with the Longines L2.718.4.50.7. Compatibility depends solely on lug width and spring bar diameter (typically 1.5 mm for watches of this category). Custom-made straps from specialised ateliers ensure superior fluid-dynamic coupling with the case, preserving aesthetic integrity and extending the overall durability of the assembly.

The longevity of a leather strap varies according to material type and usage conditions. A superior-quality alligator strap maintains structural integrity for 5–7 years of intensive daily wear; shell cordovan, owing to its crystalline density, can reach 8–10 years. A calf strap, especially vegetable-tanned, develops protective patina in the first year, extending functionality to 6–8 years. Prolonged exposure to water, moisture and perspiration accelerates ageing; rotation with alternative straps and storage in dry environments significantly extends lifespan. Specialised ateliers offer regeneration services (re-oiling, restitching) that add 3–5 additional years of useful life.