Strap for Master Collection 40 Chronograph Calendar Stainless Steel / Silver / Bracelet

The lug width of the Longines Master Collection L2.673.4.78.6 is precisely 21 millimetres. This is measured between the metal spring bars (the pins anchoring the strap to the case lugs). Any compatible strap must feature exactly 21mm width at the lug attachment point to ensure a secure, flush fit without play or excessive pressure.

For the Master Collection L2.673.4.78.6, we recommend alligator (French or Hermès leather) for formal elegance, vegetable-tanned calf for daily wear with natural patina development, or nylon ripstop NATO for versatile sportswear. Selection depends on intended use and dial colour: champagne dials suit warm leather tones, whilst black dials pair with saturated dark leathers.

Obtain a spring bar removal tool (a small extractor with flat or forked prongs). Position the tip beneath one of the two metal pins at the case lugs, gently push outward to release the internal spring. Remove the pin from the first lug and repeat on the opposite side. Align the new strap's holes with the lugs, reinsert the pins until they click into place. Avoid hammers or blunt instruments.

Yes, provided the lug width is exactly 21 millimetres. MilanoStraps are constructed specifically for this width specification. Choose from standard models (suitable for most wrists) or bespoke custom straps through the Casati Milano atelier, which adjusts length, thickness and stitching according to your wrist and personal taste.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3–5 years with daily wear. Longevity depends on tanning method (vegetable-tanned ages better than chrome-tanned), exposure to direct moisture, perspiration and cleaning frequency. With regular maintenance—drying after rain, gentle cloth wiping—many artisanal straps easily reach 7–10 years of service.