Strap for Symphonette M Diamond / Black / Bracelet

The lug width of the Longines Symphonette L2.305.0.57.6 is 9mm. This measurement is determined by the geometry of the 18.90mm case and accommodates only straps of this specific width. Any variation would create gaps between the strap and the lugs, compromising both aesthetics and functionality. To verify the measurement, use a digital calliper positioned perpendicularly between the two lugs.

For the Symphonette L2.305.0.57.6, we recommend alligator leather with regular grain in warm tones (burgundy, cognac, chocolate brown): the uniform texture enhances the minimalist dial without weighing down the miniaturised case. Shell cordovan represents the most sophisticated alternative, with a patina that develops over time. Calf leather in smooth finishes or fine grain ensures sobriety. For casual wear, technical fabric and rubber maintain the watch's dignity.

Strap replacement requires access to the attachments via spring bars. Using a dedicated spring bar tool, press the bar laterally to disengage it from one lug, remove the old strap, and insert the new one, ensuring the spring bars click securely into both lugs. To avoid damage to the stainless steel case, we recommend entrusting this task to experienced professionals: the Casati Milano atelier offers this service with professional guarantee.

Yes, provided the lug width is exactly 9mm and the spring bars are correctly dimensioned for the case. Milano Straps offers a curated selection of 9mm artisanal straps ready to ship, crafted from premium leathers (alligator, calf, shell cordovan). All our straps are tested for mechanical and aesthetic compatibility with the Symphonette. For bespoke requirements, Casati Milano crafts custom straps with personal leather selection.

Durability depends on the leather type and usage patterns. Alligator and shell cordovan, when properly maintained (avoiding prolonged moisture and dirt), guarantee 3–5 years of daily wear. Calf leather offers slightly shorter lifespan (2–4 years) due to less dense fibre structure. Vegetable-tanned leather develops a protective patina that extends service life. Milano Straps offers an 18-month warranty on all Casati Milano bespoke straps, covering manufacturing defects and stitching.