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

The lug width of the Longines Master Collection L2.893.4.51.7 is 21 millimetres. This dimension is determined by the case's constructive geometry: the lugs feature an exit angle of approximately 24 degrees and require a proportionate strap to maintain visual balance. To measure correctly, use a ruler between the two lugs on the upper side of the case where the strap is not yet mounted.

The ideal strap depends on use and personal preference. For formal contexts, authentic alligator or shell cordovan emphasise the Swiss nature of the chronograph. For daily use, vegetable-tanned calf offers a patina that ages nobly. NATO straps or FKM rubber are ideal for those prioritising practicality and aesthetic durability. All straps must be sized for the 21mm lug width.

The Longines Master Collection L2.893.4.51.7 uses a standard fixed-lug system. To change the strap: position the watch face-down, locate the upper lug, use a dedicated tool (spring bar tool) to insert the pin and relieve internal spring tension, then remove the old strap. Repeat the process with the new strap. If you lack confidence in this procedure, Casati Milano can handle the changeover.

Yes, any aftermarket strap sized for a 21mm lug width is compatible with the Longines Master Collection L2.893.4.51.7. Milano Straps offers a complete range of artisanal leather, alligator, shell cordovan and rubber straps, all available in 21mm sizing and customisable. Compatibility is guaranteed by the standardisation of spring bar attachments.

The lifespan of a leather strap depends on material quality, frequency of use and care applied. Quality calf with vegetable tanning lasts an average of 3-5 years with daily wear. Shell cordovan can last 5-7 years due to material density. Milano Straps offers an 18-month warranty on all straps produced by Casati Milano atelier, covering manufacturing defects and materials.