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

The Longines Master Collection L2.919.4.78.6 features a 21 mm lug width, an intermediate measurement requiring straps specifically designed for this dimension. Measure the internal space between the two lugs: it must be exactly 21 mm from wall to wall.

The best strap choice depends on usage and personal preference. Alligator is ideal for formal occasions due to its regular pattern and noble patina development. Vegetable-tanned calf leather offers robustness and authentic ageing. Shell cordovan represents the pinnacle for those seeking timeless quality. NATO is perfect for casual and summer looks.

To change the strap, you must remove the two spring bars that secure the strap to the lugs. Use a dedicated tool to push the internal fastener of the spring bar upward whilst extracting the strap. Insert the new strap following the reverse procedure. Casati Milano offers this service at the atelier by appointment.

Yes, you can use aftermarket straps provided they are constructed for the 21 mm lug width. MilanoStraps offers a complete collection of artisanal leather and textile straps compatible with this reference, customisable in length and finishes according to your preferences.

Longevity depends on material and usage. A quality alligator strap can last 8–10 years with ordinary care. Vegetable-tanned calf lasts 6–8 years. Shell cordovan, being denser, can exceed 15 years. Regular maintenance (gentle cleaning, protection from extreme humidity) significantly extends strap life.