Strap for Master Collection Date 29 Two Tone

The Longines Master Collection L2.257.5.78.7 features a lug width of 15 millimetres, measured internally between the extremities of the lugs. This is a non-standard dimension in the aftermarket, making precision measurement with a calliper essential before purchasing a compatible strap.

For the L2.257.5.78.7, we recommend an alligator strap in black or dark brown to achieve optimal aesthetic coherence with the two-tone case. Alternatively, a vegetable-tanned calf leather in burgundy or tobacco introduces chromatic dynamism whilst maintaining refinement. For those seeking versatility, an FKM rubber offers semi-sportive comfort without compromising the yellow gold finishing.

Strap replacement on the L2.257.5.78.7 is accomplished via spring bars that anchor the lugs to the case. Use a spring bar tool to gently remove the bars, avoiding scratches on the case. Once extracted, align the new strap holes with the lugs and secure the bars in position. For risk-free results, the Casati Milano atelier provides strap-change service during personalised consultation.

No: the Longines L2.257.5.78.7 requires a strap specifically designed for 15mm lug width. A generic 16mm strap would be loose, whilst a 14mm strap would create excessive tension during installation. We recommend purchasing straps verified and tested on your specific model, such as those available on milanostraps.it for 15mm lugs.

The lifespan of a leather strap depends on construction quality and material choice. An artisanal-grade alligator or calf leather strap, worn daily, typically lasts 4–6 years before replacement is necessary. The <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-15mm">Casati Milano collection</a> offers an 18-month warranty and allows for extraordinary maintenance interventions to extend longevity.