Longines · Master Collection

Strap for Master Collection Date 38.5 Stainless Steel / Blue - Diamond / Bracelet

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter39 mm
ReferenceL2.628.4.97.6
FamilyMaster Collection
MovementLongines caliber L888.5 Hours, Minutes, Seconds | Date | Chronometer
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 L2.628.4.97.6

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Master Collection L2.628.4.97.6, seen from the bench

The Longines Master Collection L2.628.4.97.6 embodies Swiss watchmaking philosophy with a 38.50 mm stainless steel case rooted in the legendary Master line launched in 1954. It features the L888.5 automatic movement with chronometer certification, delivering precise oscillations through its balance and hairspring. The 20 mm lug width requires careful selection when choosing an aftermarket strap, as compatibility is critical for both aesthetic and functional performance.

Frequently asked questions

What is the lug width of the Longines Master Collection L2.628.4.97.6?

The lug width of the Longines Master Collection L2.628.4.97.6 is 20 mm. This measurement represents the internal distance between the attachment points on the case and is essential for selecting a compatible aftermarket strap. Always verify this dimension before purchasing to ensure precise fit.

Which strap is most suitable for the Longines Master Collection L2.628.4.97.6?

The ideal strap depends on your intended use and aesthetic preferences. For formal elegance, an alligator leather in brown or black with vegetable tanning complements the refined 38.50 mm case proportions. For daily versatility, a soft calf leather in cognac or chocolate brown tones offers sophisticated appeal. For sporty contexts, a heavy-weight canvas NATO or FKM rubber maintains structural integrity with the 20 mm lug width.

How do I change the strap on a Longines watch?

To change the strap on your Longines Master Collection L2.628.4.97.6, you need minimal tools: a spring bar tool or small steel lever. Position the watch sideways and gently push the pin upward from below until it disengages completely. Remove the old strap and align the new one with the 20 mm lugs. Reinsert the pin until it clicks firmly into place. For precision work, professional services like Casati Milano are recommended.

Is an aftermarket strap compatible with the Longines Master Collection L2.628.4.97.6?

Yes, any strap with a 20 mm lug width is fully compatible with the Longines Master Collection L2.628.4.97.6. The market offers diverse options: premium leathers such as alligator and shell cordovan, vegetable-tanned calf, and sporty alternatives in NATO and rubber. Always verify the lug size before purchase. Artisanal straps from milanostraps.it are specifically crafted for this dimension and fully customisable.

How long does a natural leather strap last on a Longines?

A high-quality natural leather strap on a Longines Master Collection L2.628.4.97.6 typically lasts 3–5 years with daily wear, depending on moisture exposure, temperature fluctuations, and frequency of use. Materials such as alligator and vegetable-tanned calf develop character and patina over time, enhancing aesthetic appeal. The 18-month warranty on artisanal straps from Casati Milano covers manufacturing defects. Regular maintenance, including gentle cleaning and drying, significantly extends strap longevity.

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