Strap for Master Collection 42 Date Stainless Steel / Silver-Arabic / Bracelet

The lug width of the Longines Master Collection L2.893.4.78.6 is 21mm. This measurement refers to the distance between the inner lugs of the case, and must be measured with precision using a ruler positioned perpendicular to the case plane. It is essential to respect this exact dimension when purchasing an aftermarket strap, as even small variations (20mm or 22mm) would result in poor fit.

For the Master Collection L2.893.4.78.6, we recommend vegetable-tanned alligator or vintage-finished calf leather: both create visual contrast with the brushed stainless steel case and develop a noble patina over time. Alligator offers supreme elegance and superior durability, whilst calf represents a balance between everyday versatility and value. The choice depends on your dial: for black, ebony alligator; for silver, cognac alligator; for blue, mocha calf or navy NATO.

To change the strap, you must remove the spring bars connecting the lugs to the case. Use a dedicated spring bar tool (available from watchmakers or online). Position yourself on the lower part of the bar, gently lever inward until the bar retracts, then carefully extract the strap. Repeat on the other side. When inserting the new strap, ensure the spring bars are fully seated in their apertures, and verify the strap is properly centred between the lugs.

Yes, any strap with 21mm lug width is compatible with the Master Collection L2.893.4.78.6, provided the spring bars are of correct length and the strap is constructed with adequate thickness to prevent excessive play. Bespoke leather straps guarantee the best compatibility because they are crafted to your case's specific geometry. Always verify the strap is not undersized (20mm) or oversized (22mm), as this would cause fitting issues.

A quality leather strap (alligator, calf, shell cordovan) with vegetable tanning has an average lifespan of 3–5 years with daily wear, extendable to 7–10 years with regular maintenance and alternating use. Durability depends on ambient humidity, perspiration, sun exposure, and frequency of wear. Watches worn periodically develop straps that age more gracefully. Artisanal Milano leather straps offer 18-month warranty and support for restoration and finishing touch-ups.