Strap for Master Collection Date 34 Stainless Steel / Blue - Diamond / Bracelet

The lug width of the Longines Master Collection L2.357.4.97.6 is 18mm. This parameter defines the width of the attachment points for the strap to the case and is essential for ensuring compatibility with aftermarket straps. The 18mm measurement is considered the classical standard in Swiss watchmaking, ensuring balanced proportions between case and strap.

For the Master Collection L2.357.4.97.6, superior alligator leather is recommended, as its regular cotyledons dialogue perfectly with the constructive precision of the watch. Alternatively, shell cordovan offers constructive density and natural lustre, or vegetable-tanned calf leather for those desiring organic ageing patina. The choice depends on wearing context and personal aesthetic preferences.

The L2.357.4.97.6 strap is replaced using a spring bar tool, a Y-shaped instrument that allows you to push the elastic bar and release the strap from the lugs. It is advisable to perform the operation on a soft surface (microfibre cloth) to avoid accidental scratches on the case. If you are not experienced, it is preferable to consult a professional watchmaker who will complete the replacement in minutes without risk of damage.

Yes, the L2.357.4.97.6 is fully compatible with quality artisanal aftermarket straps, provided they are manufactured with an 18mm lug width. Online you will find straps customisable in fine leather (alligator, shell cordovan, calf), robust fabrics and high-density synthetic rubber. The important thing is to verify that the strap is constructed according to your model's technical specifications, and that the lug-to-lug distance is compatible.

The lifespan of a leather strap depends on constructive quality, material and frequency of use. A superior alligator or shell cordovan, if properly maintained, guarantees 3–5 years of daily wear, even up to 7 years with moderate usage. Vegetable-tanned calf leather, whilst less dense, can last 2–3 years under intensive wear conditions. The natural patina that develops over time represents aesthetic value, transforming the strap into an increasingly fascinating object. Professional artisanal straps typically include an 18-month warranty against manufacturing defects.