Strap for Symphonette XL Diamond / Black

The lug width (misura ansa) of the Longines Symphonette L2.307.0.57.0 is exactly 13mm. This measurement is specific to this ladies' model and is essential for precise strap compatibility. To verify compatibility, measure the distance between the centres of the lugs on the case using a digital calliper; the result must be exactly 13mm.

For the Symphonette L2.307.0.57.0, we recommend straps in alligator with fine grain texture (cognac, bordeaux, or medium brown tones) or calf leather with vegetable tanning. Both enhance the jewel-like elegance of the model. Alternatively, for summer versatility, a linen NATO or natural cream calf leather offer lightness without aesthetic compromise. The choice depends on your intended use and case patina.

To change the strap on the L2.307.0.57.0, you will need a spring bar tool or professional watchmaking assistance. Position the watch on a stable support, locate the small metal pins (spring bars) at the case lugs, and gently insert the tool tip to compress the internal spring. Remove the old strap and insert the new one, ensuring the attachment holes align perfectly with the pins. If you are not confident, consult a professional watchmaker.

Yes, all aftermarket straps with a 13mm lug width are compatible with the L2.307.0.57.0, provided the measurement is precise. However, we recommend verifying the exact lug width with the supplier before purchase. Higher-quality straps (alligator, shell cordovan, vegetable-tanned calf) ensure not only mechanical compatibility but also aesthetic coherence with the original model's character.

The lifespan of a natural leather strap for the L2.307.0.57.0 varies depending on the material and usage. A quality alligator or shell cordovan strap, with proper maintenance, typically lasts 3–5 years with daily wear. A vegetable-tanned calf strap generally lasts 2–3 years before showing significant wear. Factors such as sun exposure, humidity, and constant use accelerate ageing. Milano Straps provides an 18-month warranty on all personalised straps created by Casati Milano.