Strap for Master Collection Retrograde

The lug width of the Longines Master Collection L2.715.4.71.3 is 20mm. This measurement is taken by positioning a calliper inside the lug seat, completely excluding the external case flange. A lug width of 20mm is the physical rail where the strap inserts, ensuring precise compatibility with aftermarket straps specified for this dimension.

The most appropriate strap depends on intended use. For formal occasions and office wear, light brown alligator (cognac tone) represents the pinnacle of elegance, developing noble patina over time. For a severe, uncompromising aesthetic, black calf in vegetable tanning is recommended. For sport-elegant usage, a navy blue NATO maintains formality without rigidity. milanostraps.it's online offering includes all these options in 20mm width, customisable in length.

Strap replacement requires two tools: a spring bar extractor tool and a small rod or soft stick. Position the watch face-down on a soft surface. Insert the extractor into the lateral slot of the suspension pin (spring bar) until you feel the release click; extract the old strap. Repeat on the opposite side. Insert the new strap, aligning the holes with the pins, then press until the second click. To avoid the risk of scratches, the Casati Milano atelier offers a change-of-strap service by appointment with guaranteed expertise.

Any strap with a 20mm lug width is compatible with the Longines Master Collection L2.715.4.71.3. milanostraps.it offers a dedicated collection of 20mm straps in alligator, calf (smooth and grained), shell cordovan, cotton NATO, and FKM rubber. Compatibility is guaranteed; the choice is purely aesthetic and relates to the owner's usage preferences.

Lifespan depends on material and usage. An alligator or shell cordovan strap, with basic care (drying after rain, monthly rotation), lasts approximately 3–5 years before replacement is required. Vegetable-tanned calf resists 2–4 years. Wear is also a function of ambient humidity, usage frequency, and care in storage. The Casati Milano atelier guarantees 18 months on all bespoke straps, covering manufacturing defects and providing extended support for maintenance and restoration.