Strap for Master Collection Date 36 Stainless Steel Diamond

The lug width of the Longines Master Collection L2.518.4.77.3 is 19 millimetres. This measurement, also referenced as technical reference L25184773, is the internal distance between the two lugs of the case and is the fundamental parameter for selecting a compatible strap. Precise measurement is taken from the inner shoulder of the right lug to the inner shoulder of the left lug, where the lugs meet the case.

The best strap depends on intended use and personal preference. For a classical, formal aesthetic, alligator in dark brown or black with a deployant steel buckle represents the most versatile choice. Italian vegetable-tanned calf leather offers more subtle sophistication and develops an increasingly noble patina over time. For those seeking absolute robustness and brilliance, shell cordovan is unmatched. The 36mm stainless steel case pairs elegantly with warm tones (cognac, burgundy) or formal shades (black, deep blue). Straps in NATO, canvas or rubber maintain a more casual, sporty appearance.

To change the strap, remove the spring bars (lugs pins) by positioning the watch on a soft surface, locating the small lateral holes beneath the lugs, and using a spring bar tool to push the pin inward and slide it out of its seat. Once the old strap is released, insert the new one by aligning the holes with the pins and pushing until a secure click is heard. Always verify that the spring bars are firmly positioned before wearing the watch again.

Yes, any strap with a 19mm lug width is compatible with this model. Aftermarket straps offer an excellent opportunity to vary style and usage context without changing the watch. Compatibility is guaranteed by lug width: 19mm means the strap has been designed and stitched to fit perfectly the lug shoulders of the case. Always verify that the strap has been manufactured with a 19mm lug width and that the total length (lug to lug) corresponds to your wrist proportions.

Leather strap durability varies based on material, usage and maintenance. High-quality vegetable-tanned or tinted alligator can last 5-10 years with regular wear, developing an increasingly fascinating patina. Shell cordovan is even more durable, often exceeding 10 years. Vegetable-tanned calf typically lasts 3-7 years, whilst commercially tinted leathers may degrade sooner. Longevity increases if the strap is not subjected to excessive stress (moisture, continuous perspiration), is properly dried and stored, and is occasionally treated with specialised products. The 18-month warranty offered on Casati Milano straps guarantees coverage against defects in construction and materials.