Strap for Master Collection Date 25.5 Stainless Steel - Diamond / MOP

The lug width of the Longines Master Collection L2.128.0.87.3 is 13mm. This non-standard dimension is a deliberate engineering choice by Longines to maintain balanced proportions on a 25.50mm case. It is essential to measure the lugs accurately with a digital calliper, positioning it parallel to the dial between the two outer lugs: the result must be 13mm ± 0.1mm to ensure compatibility with straps specifically calibrated for this width.

The ideal strap depends on usage and aesthetic preference. For formal elegance, we recommend alligator leather with vegetable tanning, featuring pronounced selle grain that emphasises natural patina development over time. For daily versatility, vegetable-tanned calf leather offers softness and a smooth surface. Shell Cordovan (horse leather) is the choice for those seeking exceptional durability and deep patina. For simplicity and practicality, ballistic canvas NATO straps maintain the model's minimalist profile.

To change the strap, you must remove the original by unscrewing the lugs with a specific tool (spring bar tool or fine cross screwdriver). Once both lugs are unscrewed, the strap detaches from the case. Insert the new strap by aligning the lug holes with the case pins, then screw the lugs firmly without exceeding the required pressure. If the strap features a <a href="/pages/termine-glossario/deployante">deployante</a> (deployment clasp), verify it is correctly positioned to ensure secure closure on the wrist.

Yes, any quality artisanal strap manufactured with 13mm lugs is compatible with the Longines Master Collection L2.128.0.87.3. Milano Straps offers online straps ready to ship in multiple materials (alligator, calf, shell cordovan, vegetable-tanned, NATO, rubber) with the option to customise size, initials, and thread colour. For a complete bespoke experience, the Casati Milano atelier crafts made-to-order straps with direct leather selection and an 18-month warranty.

The durability of a leather strap depends on material and frequency of use. A vegetable-tanned calf strap lasts an average of 3–5 years with moderate daily wear. Alligator and shell cordovan (both vegetable-tanned) exceed 7–10 years thanks to superior leather density and natural patina protection. Vegetable tanning, unlike synthetic tanning, develops a natural protective layer over time. To maximise durability, it is advisable to rotate multiple straps seasonally and protect the strap from direct moisture and heat sources.