Strap for Master Collection 42 Moonphase Stainless Steel / Black-Roman / Alligator

The lug width of the Longines Master Collection L2.919.4.51.7 is 21mm. This measurement represents the inner distance between the two lugs of the case and determines compatibility with aftermarket straps. You can verify it by measuring the space between the inner shoulders of the lugs with a digital calliper.

For this model, a strap in alligator or shell cordovan with vegetable tanning is recommended, as it complements the brushed steel case beautifully. Alternatively, a vegetable-tanned calf leather in dark brown or taupe grey offers daily versatility. For sporty uses, a rubber strap with knit texture maintains elegance without excessive informality.

Strap changes are performed by removing the spring bars from the lugs using a dedicated fork tool. A fine-tipped pliers is recommended to grip the spring bar while extracting it. Insert the new strap ensuring the passants are aligned with the lug, then reinsert the spring bar until fully seated in its position.

Yes, numerous aftermarket straps compatible with the 21mm lug width are available online. On milanostraps.it you can find artisanal leather straps, rubber, and specialised fabrics, all customisable in dimensions, initials and stitching thread, with fast shipping.

A high-quality leather strap (alligator, shell cordovan, or vegetable-tanned calf) typically lasts 3-5 years with moderate daily use. Durability varies based on frequency of use, climate, perspiration and tanning quality. Shell cordovan straps can last 7-8 years. Regular maintenance and alternating with other straps significantly extends service life.