Strap for Elegant Collection 25.5 Automatic Stainless Steel / Red Gold / Black

The Longines Elegant L4.309.5.57.7 features a lug width of 13 millimetres. This exceptionally compact dimension is consistent with the reduced case diameter of 25.5 mm and is characteristic of Swiss ladies' dress watches. To verify the measurement accurately, insert a digital calliper between the two strap attachment holes and measure from the internal edge of one to the other: the value should read 13.0 ± 0.1 mm.

For the Longines Elegant L4.309.5.57.7, we recommend alligator leather in natural black or burgundy tones, which emphasises the formal construction of the model. Alternatively, vegetable-tanned calf leather guarantees a unique chromatic evolution over time and a distinctive patina on the wrist. Shell cordovan represents the most exclusive choice, thanks to its tactile density and natural wrinkle topography. For daily use in high-humidity environments, synthetic FKM rubber maintains minimalist aesthetics without functional compromises.

Changing the strap on the Longines Elegant L4.309.5.57.7 requires a specific tool: a spring bar remover. Position the watch on a stable surface with the case facing upward. Insert the flat end of the remover into the gap between the case and the lug, applying gentle inward pressure: the internal spring of the bar will release, freeing the lug from the hole. Repeat the operation on the opposite lug. When inserting the new strap, ensure that the spring bar is fully seated in both holes and that the strap is aligned perpendicularly to the case. A session at the Casati Milano atelier guarantees professional execution with specialised tools and without risk of micro-damage.

Yes, the Longines Elegant L4.309.5.57.7 is fully compatible with any artisanal or commercial strap with a 13 mm lug width. However, it is essential to verify that construction tolerances are rigorous: undersized straps (12 mm) would sit loose, whilst oversized ones (14 mm) would force the internal guides during installation. We recommend using straps certified by specialised craftspeople, such as those available from milanostraps.it, which guarantee precise tolerances and materials of excellence.

The lifespan of a leather strap depends on construction quality, material type and conditions of use. An artisanal alligator or shell cordovan strap, subjected to regular maintenance and controlled humidity conditions, guarantees a longevity of 4–6 years before requiring regeneration. Vegetable-tanned calf leather, thanks to the natural fibre resistance, reaches 5–7 years. The Casati Milano atelier provides an 18-month warranty on bespoke straps and offers restoration and regeneration services to indefinitely extend the life of the original strap.