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Longines · Master Collection

Strap for Master Collection 42 Chronograph Stainless Steel / Silver-Arabic / Alligator XL

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
Lug width21 mm
Case diameter42 mm
ReferenceL2.759.4.78.5
FamilyMaster Collection
MovementLongines caliber L688.2 hours, minutes, small seconds | date | Chronograph, column wheel
Year2011
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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Straps for the Master Collection L2.759.4.78.5

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Master Collection L2.759.4.78.5, seen from the bench

The Master Collection represents one of Longines' classic lines characterized by elegant design and traditional complications. The model L2.759.4.78.5 mounts the automatic caliber L688.2 with column-wheel chronograph function, indication of hours, minutes, small seconds, and date. The lugs measure 21mm in width.

Frequently asked questions

What is the lug width of the Longines Master Collection L2.759.4.78.5?

The lug width of the Longines Master Collection L2.759.4.78.5 is 21mm. This measurement is specific to this reference and determines strap compatibility. You can verify it by measuring the internal distance between the two lugs of the case using a calliper.

Which strap should I choose for the Longines Master Collection L2.759.4.78.5?

For the Master Collection L2.759.4.78.5 we recommend black or brown alligator for formal elegance, vegetable-tanned leather for character that ages over time, NATO for sports versatility, or rubber for technical durability. The choice depends on your primary use and personal aesthetic preferences.

How do I change the strap on a Longines Master Collection?

To change the strap, use a spring bar tool: gently push the spring bar pin outward from the lug, remove the old strap, align the new strap holes with the lugs, and reinsert the pin with even pressure until it clicks into place.

Is an aftermarket strap compatible with the Master Collection L2.759.4.78.5?

Yes, any strap with a 21mm lug width is compatible with the Master Collection L2.759.4.78.5. You can choose from bespoke artisanal straps, sports NATO straps, or rubber straps, all available in the correct width.

How long does a leather strap last on a Longines Master Collection?

A premium leather strap (alligator, vegetable-tanned calf) typically lasts 3-5 years with daily wear, depending on exposure to moisture, sunlight and mechanical stress. Regular maintenance (gentle cleaning, conditioning) extends durability. Casati Milano guarantees their straps for 18 months.

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