Strap for Master Collection 34 Moonphase Stainless Steel - Yellow Gold / MOP / Bracelet

The Longines Master Collection L2.409.5.87.7 features a lug width of 18 millimetres. The lug width, also termed ansa measurement, represents the distance between the two attachment pins where the strap secures to the case. This 18mm dimension is specific to the 34mm model and is essential for ensuring compatibility with any aftermarket strap. To verify this precisely, extract the strap using a dedicated tool (spring bar tool) and measure the exact distance between the two attachment points with a digital calliper.

For the Master Collection L2.409.5.87.7, alligator leather represents the most appropriate choice from both aesthetic and structural perspectives. The natural grain of alligator skin creates a uniform texture that dialogues elegantly with the mother-of-pearl dial and case materials. A havana-brown or dark brown alligator strap emphasises the yellow gold tonality, whilst a black version amplifies the contrast between steel and precious materials. Alternatively, shell cordovan offers superior structural properties and develops a magnificent natural patina over time, maintaining the dimensional fidelity critical for deployante compatibility.

Strap replacement requires a dedicated tool called a spring bar tool. Procedure: 1) position the watch on a soft surface with the dial facing downward; 2) insert the thin tip of the spring bar tool beneath the attachment pin, compressing the internal spring; 3) extract the pin whilst the spring is compressed; 4) repeat on the opposite lug; 5) insert the new strap's pins by reversing the procedure, ensuring the pin clicks fully into position. It is advisable to verify the lug width (18mm) prior to proceeding, and avoid excessive force to prevent case damage.

All straps manufactured for an 18-millimetre lug width are compatible with the Master Collection L2.409.5.87.7, provided the pin diameter matches the watch specification (standard 1.8mm in this category). Milanostraps.it offers a comprehensive collection of 18mm straps customisable in leather (alligator, calf, shell cordovan with vegetable tanning), NATO textile and vulcanised rubber Tropic. Prior to purchase, confirm that the selected strap is indeed certified for 18mm and that the retailer provides technical support for installation.

The lifespan of a leather strap varies according to material type, usage intensity and maintenance. A high-quality alligator strap maintains structural integrity for 5-7 years of daily wear, after which the leather begins to show stress at the lug junction. Shell cordovan, owing to its superior density, can endure 8-10 years or longer whilst developing a fascinating patina. Vegetable-tanned calf, whilst characterful, typically wears more rapidly (3-5 years). Longevity depends critically on protection from humidity, regular rotation and gentle cleaning. Atelier Casati Milano supplies straps with an 18-month warranty and offers restoration services to extend useful life.