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Longines · Master Collection

Strap for Longines Master Collection L2.919.4.51.7

The Master Collection 42 Moonphase Stainless Steel / Black-Roman / Alligator takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

21mm
21 mm strapsAll Longines
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Lug width21 mm
Case diameter42 mm
ReferenceL2.919.4.51.7 (aka: L29194517, L001155205)
FamilyMaster Collection
MovementLongines caliber L899.2 Hours, Minutes, Small seconds | Date | Moonphase
Year2019
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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What I'm asked about the Longines Master Collection L2.919.4.51.7

What strap size does the Longines Master Collection L2.919.4.51.7 take?

The Longines Master Collection L2.919.4.51.7 needs 21 mm between the lugs, usually 18 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Longines Master Collection L2.919.4.51.7 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Longines Master Collection L2.919.4.51.7?

Yes, in 21 mm leather. On a 42 mm dress watch alligator is the natural choice: thin, elegant, what it was born for.

Which strap do you recommend for the Longines Master Collection L2.919.4.51.7?

A thin 21 mm alligator. You'll find it ready in the 21 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

Straps for the Master Collection L2.919.4.51.7

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Master Collection L2.919.4.51.7, seen from the bench

The Longines Master Collection L2.919.4.51.7 is a 42mm stainless steel watch combining Swiss watchmaking tradition with contemporary design. Powered by the L899.2 automatic caliber, it features hours, minutes, small seconds, date, and moonphase complication. The satin-finished steel case pairs with a black Roman dial, and the 21mm lug width accommodates a wide range of aftermarket straps including leather and technical rubber options without requiring adaptors.

Frequently asked questions

Which strap is best suited for the Longines Master Collection L2.919.4.51.7?

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.

Are aftermarket straps available that are compatible with the L2.919.4.51.7?

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.

How long does a leather strap last on a watch like the Master Collection?

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.

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.

Request an appointment →

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

The atelier's website: casatimilano.com