Technical Archive

Longines
Master Collection L2.759.4.51.8— lug 20mm

Longines Master Collection L2.759.4.51.8: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Master Collection 42 Chronograph Stainless Steel / Black-Roman / Alligator XL

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Longines L2.759.4.51.8
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

L2.759.4.51.8

Movement

Longines caliber L688.2 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel

The Heritage

The Longines Master Collection features the automatic Caliber L688.2 with a column-wheel chronograph function. The movement offers hours, minutes, small seconds, and date indication. The L2.759.4.51.8 reference presents the chronograph with a column-wheel system for improved precision in button actuation.

FAQ

What is the lug width of the Longines Master Collection L2.759.4.51.8?

The lug width (also called spring bar distance) of the Longines Master Collection L2.759.4.51.8 is 20mm. This measurement is calculated by measuring the inner distance between the two lug axes, from the case shoulders to the point where the strap keeper contacts the lugs. It is the technical standard for this category of mid-large chronographs and solely determines the width of the strap to be fitted.

Which strap pairs best with the Longines Master Collection L2.759.4.51.8?

The ideal strap depends on personal style and dial colour. For dark dials (black, blue), we recommend cognac alligator or vegetable-tanned calf leather: both develop an elegant patina over time. For a casual-sporty approach, a heavyweight NATO canvas or military rubber strap emphasises the instrumental character. Polished black alligator represents the most versatile and refined choice, suitable for every occasion.

How do I change the strap on the Longines Master Collection L2.759.4.51.8?

Strap replacement requires a specific tool (spring bar tool or lug lever). Carefully remove the current strap by gently lifting the two side pins that hold the keeper to the lugs. Insert the new strap by snapping the pins into the dedicated holes. If you lack experience, contact a professional watchmaker to avoid damage to the case. The operation takes just a few minutes and allows complete personalisation of your chronograph.

Can I use a third-party aftermarket strap on this Longines model?

Yes, absolutely. The Longines Master Collection L2.759.4.51.8 features straight lugs without particular geometry, allowing broad compatibility with artisan aftermarket straps of 20mm width. You may choose from premium leathers (alligator, shell cordovan, calf), fabrics (NATO, canvas) and rubber, completely personalising the watch's aesthetic. Always verify the width is correct before purchase.

How long does a leather strap last on the Longines Master Collection L2.759.4.51.8?

The lifespan of a leather strap varies depending on the material, daily use and maintenance. High-quality alligator or shell cordovan can last 3-5 years with regular wear and consistent care. Vegetable-tanned calf typically has a slightly shorter lifespan (2-4 years) but develops a more distinctive patina. Factors such as perspiration, sun exposure and humidity accelerate ageing. Regular cleaning and alternating with other straps significantly extend useful life.