Strap for Master Collection 40 Date Stainless Steel / Black-Diamond / Bracelet

The Longines Master Collection L2.793.4.57.6 features an exact lug width of 21mm. It is essential to measure the internal distance between the lugs to verify compatibility: a 20mm strap would create lateral play, while a 22mm strap would force the lugs. On milanostraps.it you will find a complete selection of 21mm straps tested for this specific model.

Alligator with medium grain is the optimal choice: regular texture that frames the dial without competing, understated elegance. Shell cordovan is the alternative for chromatic depth and natural patina development over time. Vegetable-tanned calf offers a more rustic and informal profile. Avoid excessively sporty choices like NATO, which compromises the sartorial geometry of the timepiece.

Remove the watch from your wrist. Using a spring bar tool, position the tip beneath the lug pin and apply gentle upward pressure to release the internal spring. The pin will slide out. Repeat on the other side. Insert the new strap by pressing the pins into the lug holes and verify they are fully locked. If unsure, consult a professional watchmaker to avoid damaging the case.

Yes, provided the lug width is exactly 21mm. Many premium straps (Hirsch, Barenia, artisanal) are compatible with this dimension. On milanostraps.it you can choose from ready-to-ship models or custom pieces from the Casati Milano atelier. Always verify dimensions before purchasing.

A quality natural leather strap (alligator, cordovan, vegetable-tanned calf) typically lasts 3-4 years with daily wear and ordinary care. Longevity depends on sun exposure, humidity, and frequency of use. Artisanal straps from milanostraps come with an 18-month warranty. To extend lifespan, avoid excessively humid environments and condition the leather every 6 months with specialist oils.