Longines · Master Collection

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

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter42 mm
ReferenceL2.919.4.51.6 (aka: L29194516, L001155202)
FamilyMaster Collection
MovementLongines caliber L899.2 Hours, Minutes, Small Seconds | Date | Moonphase
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Master Collection L2.919.4.51.6 (aka: L29194516, L001155202)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Master Collection L2.919.4.51.6 (aka: L29194516, L001155202), seen from the bench

The Longines Master Collection is powered by the L899.2 caliber with hour, minute, small seconds, date and moon phase functions. The reference L2.919.4.51.6 features 21mm lugs. The movement provides moon phase indication in addition to the basic timekeeping functions.

Frequently asked questions

What is the lug width of the Longines Master Collection L2.919.4.51.6?

The lug width is 21mm, representing the distance between the two spring bars on the case. This measurement is essential for determining cinturino compatibility. Verifying this dimension before purchasing an aftermarket strap is crucial, as any discrepancy will result in fitting difficulties.

What is the best strap for the Longines Master Collection L2.919.4.51.6?

The optimal choice depends on intended use. For formal occasions, alligator leather in brown or black aligns perfectly with the watch's character, offering durability and beautiful patina development. Vegetable-tanned calf leather provides softness and daily versatility. Premium rubber remains ideal for sports and humid environments.

How do I change the strap on my Longines Master Collection L2.919.4.51.6?

Remove the spring bars from the case using a specialised remover tool. Insert the bars into the strap lugs and secure them in the case holes. We recommend having this performed by a professional or Casati Milano to prevent case damage.

Can I use aftermarket straps compatible with my Longines?

Yes, provided they conform to the 21mm lug width specification. Milanostraps.it offers a comprehensive range of artisanal straps in various materials—alligatore, calf leather, shell cordovan, and rubber—fully customisable in width, colour, and stitching thread.

How long does a leather strap last on the Longines Master Collection L2.919.4.51.6?

Longevity depends on material and usage patterns. Premium alligator or shell cordovan typically endures 8-12 years of daily wear, developing distinguished patina. Vegetable-tanned calf leather offers comparable durability (7-10 years), whilst premium rubber resists 5-7 years. Regular maintenance—gentle cleaning and occasional hydration—significantly extends strap lifespan.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only