Strap for Master Collection 44 Retrograde Moonphase Stainless Steel / Black-Roman / Alligator XL

The lug width of the Longines Master Collection L2.739.4.51.8 is 22mm. This measurement is specific to the Master Collection models of this generation and represents the distance between the two lugs connecting the strap to the case. It is essential to measure this distance accurately by positioning a calliper on the inside of the case, between the spring bar holes, to ensure perfect compatibility with any aftermarket strap.

The best strap depends on your style of use and aesthetic preferences. For formal occasions, we recommend an alligator strap in vegetable tanning with navy blue or calf leather in dark brown, creating an elegant chromatic synergy with the silver dial and steel case. For a more versatile approach, Provence shell cordovan offers natural lustre that develops over time. If practicality is your priority, structured FKM rubber guarantees water resistance and scratch resistance whilst maintaining the formality of the timepiece.

To change the strap on the L2.739.4.51.8, you must remove the spring bars from the holes inside the case using a dedicated tool or a thin screwdriver. Position the tool under the spring bar, apply gentle leverage to release the spring tension, and slide off the old strap. Then insert the new strap (ensuring it has the same 22mm lug width) into the available spaces and push the spring bar until the spring locks back into place. Verify that the strap is securely fastened before wearing the watch.

Any aftermarket strap with a 22mm lug width is compatible with the L2.739.4.51.8, provided it is fitted with suitable spring bars. MilanoStraps offers a comprehensive range of 22mm straps in alligator, calf, shell cordovan, rubber and technical materials. It is important to verify that the strap is equipped with adjustable spring bars or pre-sized for 22mm lugs, and that the total length (from the centre of the first lug to the end of the strap) is sufficient for your wrist, typically between 250 and 280mm for comfortable wear.

The lifespan of a leather strap depends on leather quality, tanning method, frequency of use and environmental conditions. An alligator or calf strap in vegetable tanning, with moderate daily use, can last between 3 and 5 years before showing significant signs of wear such as leather cracking or stitching deterioration. FKM rubber has a slightly longer lifespan (4-6 years) thanks to greater resistance to UV rays and moisture. To extend durability, avoid prolonged exposure to direct heat sources and remove the strap during nighttime rest, allowing the leather to breathe and dry completely.