Strap for Master Collection 38.5 Day Date Stainless Steel / Silver-Arabic / Bracelet

The lug width of the Longines Master Collection L2.755.4.78.6 is precisely 20 millimetres. This measurement refers to the distance between the attachment points of the lugs to the case, not the visible protrusion. To verify correctly, position a digital calliper perpendicular to the lug, measuring the internal space where the strap sits. A common error is confusing this measurement with the total visible lug width: 20 mm is the exact constructional specification for strap compatibility.

For the Master Collection L2.755.4.78.6, vegetable-tanned alligator represents the supreme aesthetic choice: natural back texture, fine and regular grain, patina that improves over time. Shell cordovan in vegetable tanning offers superior resistance and fascinating patina development. Calf box leather is an economical yet respectable alternative with greater durability. For casual contexts, a NATO strap in cotton-polyester is practical. Choice depends on intended use: formal elegance requires alligator or cordovan; daily practicality suggests calf or cordovan alternatives.

Changing the strap on the Master Collection L2.755.4.78.6 requires extraction of the spring bars from the lugs. Position the watch on a dedicated stand, locate the small circular holes on the case shoulders, insert a thin tool (dedicated lever or watchmaker's needle) into the rear hole to depress the spring bar, then remove the current strap. Insert the new 20 mm strap, aligning it with the lugs, and release the spring bar to secure into the mounting points. If inexperienced, consult a watchmaker: risk of scratching the case or improper strap insertion exists.

Yes, any strap with 20 mm lug width is compatible with the Master Collection L2.755.4.78.6, provided the strap is correctly constructed and exhibits no excessive manufacturing tolerances (loose fitting). It is advisable to select straps from artisans specialising in luxury watch accessories, who understand precise engineering specifications and critical tolerances. Generic low-quality straps may cause fitting issues or accelerated wear. MilanoStraps offers a comprehensive range of artisanal 20 mm straps, customisable and verified for compatibility with timepieces of this calibre.

Leather strap longevity depends on material type, tanning method, frequency of use and environmental conditions. Vegetable-tanned alligator, with regular care, lasts 5–7 years in daily wear. Shell cordovan typically resists 6–8 years due to superior structural density. Calf box, being more delicate, wears in 3–5 years. Maintenance is critical: clean regularly with damp cloth, avoid prolonged direct sunlight exposure, do not immerse in water, occasionally apply natural wax layer. A quality artisanal strap improves aesthetically over time, developing characteristic patina that renders the watch increasingly compelling.