Strap for Master Collection Big Date

The lug width of the Longines Master Collection L2.648.4.51.5 is 20 millimetres. This measurement determines the physical compatibility of any aftermarket strap: ensure that the chosen strap has a lug width of exactly 20mm to guarantee correct accommodation of the lugs and spring bar.

For the Longines L2.648.4.51.5, an alligator or Nile crocodile strap is recommended for maximum aesthetic refinement, or a chromium-tanned leather in black, brown or burgundy for versatility and aging resistance. A vegetable-tanned strap with a cognac brown pull-up effect creates a warm dialogue with the blue dial, whilst a silk acetate NATO represents the choice for more informal contexts.

To change the strap, you need a dedicated tool (spring bar tool) to remove the spring bars from the case lugs. Remove the spring bar from the non-visible side, take out the original strap, then thread the new strap by aligning the lugs to the case holes and reinsert the spring bar until it clicks into place. If you lack experience, entrust the task to a professional watchmaker to avoid case damage.

Yes, any strap with a 20-millimetre lug width is physically compatible with the Longines Master Collection L2.648.4.51.5. Compatibility depends solely on the lug width: always verify this measurement before purchase. Custom-made artisanal straps guarantee superior aesthetic and constructive personalisation compared to standard factory solutions.

The durability of a leather strap varies according to the material, use and maintenance. An alligator or quality calf strap, worn daily, maintains functionality for 3-5 years before requiring replacement of the buckle or deployant clasp. Vegetable tanning ages better visually but is more sensitive to humidity; a well-maintained and periodically nourished strap can last 7-10 years. A NATO textile strap guarantees greater longevity (10-15 years) with minimal maintenance.