Strap for Master Collection Date 34 Stainless Steel / Silver

The lug width of the Longines Master Collection L2.357.4.78.3 is precisely 18 millimetres. This measurement refers to the distance between the strap attachment points on the case and must be strictly adhered to in order to maintain the aesthetic proportions of the watch. Any compatible strap must feature lugs of exactly 18 millimetres.

For the Longines Master Collection L2.357.4.78.3, several options are recommended depending on intended use and aesthetic preference. Alligator represents the most refined choice, with regular grain and a natural patina that ages gracefully. Vegetable-tanned calf offers a softer texture and develops warm amber hues over time. Shell cordovan, if available in this lug width, provides structural compactness and natural lustre. For sportier contexts, NATO fabric straps or technical FKM rubber allow greater versatility of application.

Strap replacement requires a springbar remover tool, a small and specific instrument. Position your wrist under adequate lighting, carefully insert the tip of the springbar remover into the small hole adjacent to the lug of the case, gently lift to free the metal bar that holds the strap in place, then remove the old strap. Repeat the procedure on the opposite side. Insert the new strap whilst maintaining the bar in the raised position using the same tool. If uncertain, consult a professional: watch repairers and specialised ateliers such as Casati Milano offer this service.

Yes, you may use a compatible aftermarket strap, provided the lug width is exactly 18 millimetres and the total length is appropriate for your wrist. Many quality strap manufacturers—including those available through milanostraps.it—produce straps specific to this dimension. The key is to verify that the strap is constructed from durable materials and that it is customisable in terms of length, as wrist circumferences vary significantly.

The longevity of a leather strap depends on material quality, frequency of wear and environmental conditions. A quality alligator or vegetable-tanned calf strap, worn daily under normal conditions, maintains structural integrity for 3 to 5 years before visible wear becomes apparent on the underside. Alligator tends to last slightly longer than calf owing to its natural density. Direct sun exposure, sustained humidity and prolonged perspiration accelerate ageing. Casati Milano offers an 18-month warranty on straps, covering manufacturing defects and stitching.