Strap for Master Collection Date 36 Stainless Steel

The lug width of the Longines Master Collection L2.518.4.51.7 is 19mm. This dimension is the historical standard for 36mm wrist watches according to vintage proportions. To verify strap compatibility, measure at the deepest point of the lug with a digital calliper: it must measure 19mm ± 0.5mm to ensure smooth insertion without excessive play.

African alligator is the most refined choice for this model: regular grain texture, symmetrical plate profile and natural rigidity deliver elegance without ergonomic compromise. Novonappa calf offers tactile softness and superior plasticity. Japanese shell cordovan develops rich patina over time but requires regular maintenance. For sporting use, raw canvas straps with stainless steel deployante buckles maintain conservative aesthetics with superior practicality.

The strap is changed by opening the case with a specialised tool (spring bar tool). Locate the metal pins (spring bars) at the ansa ends: compress each pin gently toward the centre while simultaneously levering the old strap outward. Once the lugs are free, align the new strap and reinsert the spring bars into the slots, ensuring the pin clicks into place. The procedure requires care to avoid scratching the stainless steel case.

Yes, any strap with a 19mm lug width is compatible. Compatibility depends solely on lug width, not on strap brand. On milanostraps.it you will find artisanal 19mm straps customisable in leather, stitching thread and initials. Always verify measurement before purchase to guarantee ± 0.5mm tolerance.

Durability depends on material and maintenance. African alligator maintains structural integrity for 8-10 years with regular brushing. Novonappa calf lasts 5-7 years. Shell cordovan, if treated monthly with leather cream, easily exceeds 12 years. Maintenance consists of brushing every two weeks to remove dust and perspiration, monthly conditioning treatment, and storage in a dry environment. Accelerated wear depends on constant humidity, prolonged direct sunlight exposure and intensive body perspiration.