Strap for Master Collection Small Seconds XL

The lug width of the Longines Master Collection L2.640.4.78.5 is 25 millimetres. This measurement refers to the distance between the two lateral lugs that secure the strap to the case. It is essential to verify this specification before purchasing an aftermarket strap, as only 25mm models will ensure proper mechanical stability and correct fit on the watch.

The optimal strap depends on usage profile and aesthetic preferences. For sartorial excellence, genuine alligator is recommended: regular scale texture, tactile softness, and natural patination over time. Shell cordovan represents a refined alternative, with inherent elasticity and burgundy tones that evolve. For daily wear and versatility, vegetable-tanned leather offers equivalent quality with sustainability. NATO fabric remains the ideal choice for humid environments or water sports.

The procedure is standardised: remove the spring bars securing the existing strap using a spring bar tool, inserting the narrow tip beneath each bar to release it from the lateral lugs. Once extracted, the old strap slides away from the case. To install the new strap, align the holes in the leather with the bars and reinsert them into the lugs, verifying proper anchorage. Many collectors entrust this operation to a qualified watchmaker to avoid damage.

Yes, provided it is specifically manufactured for the 25-millimetre lug width. High-quality aftermarket straps maintain the same mechanical compatibility and stability characteristics as originals. The crucial factor is selecting certified suppliers that guarantee precise manufacturing tolerances and materials that will not damage the stainless steel case. Custom bespoke straps offer personalisation opportunities unavailable in serial versions.

A high-quality leather strap—alligator, shell cordovan, or vegetable-tanned leather—maintains functionality and appearance between 3 and 7 years, depending on intensity of daily wear and climatic exposure. Prolonged humidity exposure accelerates wear, as do repeated stresses on the passant and deployante clasp. The natural patina that develops is a desirable aesthetic element, a sign of dignified ageing of the material. Rotating between multiple straps extends the longevity of each, a practice recommended for conscious collectors.