Strap for Master Collection 40 Moonphase Stainless Steel / Silver-Diamond / Bracelet

The Longines Master Collection L2.909.4.77.6 has a lug width of 21mm. This is a rare and specific measurement for this model, requiring a strap to be custom-ordered in this exact width. Measurement is performed with a digital calliper, measuring the distance between the two lugs' pin holes.

For the formal nature of this timepiece, we recommend alligator in cognac or black, which creates an elegant contrast with the stainless steel case. Shell cordovan is the choice for those seeking a legendary leather with unique patina development over time. Vegetable-tanned calf offers a good compromise between elegance, versatility and daily durability.

The strap is changed by extracting the two spring bars that support the lugs. Use a dedicated tool (spring bar tool) to compress the pin and slide it out of the hole. Insert the new strap by aligning the hole with the pin and release. Verify that both spring bars are firmly secured before wearing the watch.

Yes. Any strap with 21mm lug width is compatible. Online at milanostraps.it you will find artisanal straps in alligator, shell cordovan and vegetable-tanned calf, customisable and ready for delivery. For a bespoke experience, Casati Milano atelier creates custom straps with an 18-month guarantee.

A quality strap (alligator or shell cordovan) lasts 3–5 years with daily wear. Vegetable-tanned calf and calf offer slightly lower durability, around 2–4 years. Longevity depends on frequency of use, environmental factors (humidity, perspiration) and maintenance. Artisanal straps from milanostraps.it are guaranteed for 18 months against manufacturing defects.