Strap for Master Collection 38.5 Day-Date Stainless Steel / Yellow Gold / Silver-Diamond / Bracelet

The lug width (misura ansa) of the Longines Master Collection L2.755.5.77.7 is 20 mm. Measure from the inside of one lug to the inside of the opposite lug, perpendicular to the case. This dimension is critical for strap compatibility.

For this model, alligator leather with vegetable tanning is the supreme choice: the regular grain and natural patina development enhance the classic character of the yellow gold case. Hermès calf offers versatility, whilst shell cordovan in dark tones amplifies aesthetic richness.

The strap is replaced by removing the spring bars positioned in the case lugs. Use a dedicated tool to depress the bar and extract it. Once freed, the old strap slides away. The new 20 mm strap is inserted by aligning the lugs and reinserting the spring bars until the security click.

Yes, provided it has a 20 mm lug width. Artisanal quality straps—in alligator, calf, or shell cordovan—mount identically to OEM Longines straps. Compatibility depends exclusively on lug width, not on strap brand.

A high-quality artisanal leather strap typically lasts 3–5 years with daily wear, depending on climate and maintenance. Vegetable tanning ages visually but maintains structural integrity. Exposure to sweat, direct sunlight, and humidity accelerates wear. An 18-month warranty (Casati Milano) covers manufacturing defects.