Strap for Master Collection Date 36 Two Tone Diamond

The lug width of the Longines Master Collection L2.518.5.77.7 is 19mm. This dimension is characteristic of the Master models at 36mm from this generation. To measure correctly, position the ruler perpendicularly across the lugs, from the outer edge of one to the other. Precise measurement is essential to ensure proper strap fit and durability of the lug seats.

For the two-tone Master Collection L2.518.5.77.7 (yellow gold and stainless steel), we recommend a dark brown or cognac alligator, which complements the gold without competing visually. Alternatively, vintage calf leather with natural patina offers timeless elegance. For everyday versatility, a graphite grey or navy NATO canvas allows broader wardrobe pairing, though with a more casual tone.

Changing the strap on the Longines Master requires a specific tool (spring bar tool) or professional watchmaker assistance. Position the watch with lugs facing upward, insert the tool into the designated slot, and gently push to open the spring bar. Once released, remove the previous strap and insert the new one, ensuring the pins align correctly before releasing the spring. If inexperienced, contact an authorised service centre.

Any strap with a 19mm lug width is theoretically compatible. However, verify that leather thickness does not exceed 3-3.5mm and that pins are made of stainless steel to prevent oxidation. Milano Straps manufactures 19mm straps precisely calibrated for this model, guaranteeing measurement accuracy and construction quality consistent with the timepiece.

The lifespan of a leather strap depends on material and wear patterns. Quality alligator leather lasts 3 to 5 years with daily use, ageing gracefully. Vintage calf can last 2–4 years before replacement becomes necessary. Critical factors: avoid prolonged water exposure (the Master Collection is water-resistant to 30m, not waterproof), protect from direct sunlight, and regularly clean the strap with a damp cloth to remove salt and dirt.