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Longines · Master Collection

Strap for Master Collection Small Seconds

Takes 25 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

25mm
25 mm strapsAll Longines
Lug width25 mm
Case diameter48 mm
ReferenceL2.640.4.51.5 (aka: L26404515)
FamilyMaster Collection
MovementLongines caliber L512 Hours, Minutes, Small Seconds
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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The Master Collection L2.640.4.51.5 (aka: L26404515), seen from the bench

The Master Collection represents one of Longines' classic lines characterized by traditional design and mechanical movement. The reference L2.640.4.51.5 features the L512 caliber with hours, minutes and small seconds indication. The watch has 25mm lugs and a construction in line with the collection's standards.

Frequently asked questions

What is the lug width of the Longines Master Collection L2.640.4.51.5?

The <a href="/pages/termine-glossario/misura-ansa">lug width</a> of the Longines Master Collection L2.640.4.51.5 is 25 millimetres. This measurement refers to the precise distance between the two attachment points (lugs) where the strap is inserted. It is essential to respect this specification to ensure correct strap fit and prevent lateral movement or structural failure.

What is the best strap material for the Longines Master Collection L2.640.4.51.5?

For the Master Collection L2.640.4.51.5, we recommend natural <a href="/pages/termine-glossario/alligatore">alligator</a> leather in dark brown or cognac hues, as it enhances the understated elegance of stainless steel. Alternatively, calf leather with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> is a contemplative choice that develops rich patina over time. For intensive use and humid conditions, natural vulcanised rubber represents the most durable technical solution.

How do you change the strap on a Longines watch?

To change the strap, position the watch on a soft surface with the crown facing upward. Using a spring bar removal tool, gently push the small metal pin (spring bar) inward to release the strap from the lug attachment. Once the old strap is removed, align the new strap with the lug slots and ensure the spring bar clicks securely into position. Verify that both sides are correctly locked before wearing the watch.

Does the Longines Master Collection L2.640.4.51.5 accept aftermarket straps?

Yes, the Longines Master Collection L2.640.4.51.5 accommodates quality aftermarket straps, provided they respect the <a href="/pages/termine-glossario/misura-ansa">25mm lug width</a>. Milanostraps.it offers a comprehensive selection of bespoke straps compatible with this model, crafted from <a href="/pages/termine-glossario/alligatore">alligator</a>, calf, shell cordovan and natural rubber. Each strap can be personalised in length, initials and thread colour.

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

A quality leather strap, made with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> or <a href="/pages/termine-glossario/alligatore">alligator</a>, typically lasts 3-5 years with moderate daily use. Longevity depends on sun exposure, humidity levels and frequency of wear. Casati Milano bespoke straps include an 18-month warranty and can be serviced or regenerated after years of use, significantly extending the lifecycle.

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