Strap for Master Collection 40 Date Stainless Steel / Silver - Roman / Bracelet

The lug width of the Longines Master Collection L2.793.4.79.6 is precisely 21mm. This is a rare manufacturing specification within the Master Collection lineup. To verify the measurement, use a digital calliper inserted into the lug cavity on the case back, measuring the distance between the two spring bar holes. The tolerance is ±0.2mm; any strap mounted must fit without play.

For a timepiece of this technical and aesthetic calibre, alligator with mature patina and regular texture represents the most authoritative choice: it delivers chromatic depth and wrist adaptability without additional loops. Vegetable-tanned calf is ideal for robust daily use, developing characteristic patina over time. Shell Cordovan is perfect for those seeking a virtually indestructible strap with natural lustre. A NATO in Cordura maintains technical character in informal contexts.

To change the strap, use a dedicated spring bar removal tool or a small flat-blade screwdriver. Position the watch face-down, locate the small hole on the upper part of the lug. Insert the tool into the hole and gently extract the pin, avoiding scratching the case. Repeat on the opposite end. Replace the worn strap by inserting the new pins into the loops, ensuring both pins are fully seated and the strap does not move laterally.

The Longines Master Collection L2.793.4.79.6 requires straps with precisely 21mm lug width. On the aftermarket, this specification is rare compared to standard 20mm or 22mm formats. Custom artisanal straps represent the most reliable solution for perfect compatibility. Online, ready-to-ship 21mm straps are available, customisable in material, exact wrist sizing, initials, and stitching thread type.

The lifespan of a leather strap depends on material and usage. Alligator and vegetable-tanned calf require regular maintenance (annual hydration with specific balms) and guarantee 3–5 years with moderate daily wear. Shell Cordovan, extremely resilient, can last 7–10 years or longer with proper care. A custom artisanal strap, made from premium leather, carries an 18-month warranty from manufacture and can be regenerated through restitching and resizing.