Strap for Master Collection Date 42

The Longines Master Collection L2.665.4.78.6 features 21.00mm lugs, which is a specific and unconventional size as most 42mm chronographs use 20mm or 22mm lugs. To verify proper compatibility, measure the distance between the lug pins with a digital calliper, positioning it perpendicular to the case.

The best strap depends on your intended use and aesthetic preferences. For formal settings, cognac alligator with natural beige stitching is ideal. For daily wear with character development, vegetable-tanned calf offers a personalised patina over time. For sporty applications, canvas NATO or black rubber ensure practicality and chromatic versatility.

Strap replacement requires a dedicated spring bar removal tool. Position your watch on a soft cloth, locate the spring bars (small metal cylinders securing the lugs to the case), and gently push them outward using the appropriate tool. Caution: 21mm lugs require tools specifically calibrated for this width. For safety, consult a professional watchmaker.

Yes, provided the strap is specifically designed for 21mm lugs. Quality aftermarket straps are fully compatible with the Longines Master Collection L2.665.4.78.6, offering greater aesthetic and functional variety compared to the original strap. Always verify that your supplier explicitly specifies the lug width as '21mm' to avoid incompatibility.

A natural leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years with daily wear, provided regular cleaning and protection from excessive moisture. Vegetable-tanned leather develops a patina that increases durability over time. Climate, body perspiration and sun exposure influence longevity. Atelier Casati Milano offers an 18-month warranty on all personalised straps.