Strap for Master Collection Small Seconds

The lug width of the Longines Master Collection L2.640.4.78.3 is 25mm. This is the horizontal distance between the strap attachment lugs and is the fundamental parameter for selecting a compatible strap. It should not be confused with the case diameter (47.50mm). To verify with precision, measure the space between the upper and lower attachment points using a digital calliper.

For the L2.640.4.78.3, several options are recommended based on your desired style: alligator (cognac or black) for maximum refinement, vegetable-tanned calf leather (burgundy or brown) for a more assertive aesthetic, shell cordovan for an elegant solution with character, and structured rubber for practicality without aesthetic compromise. Each material enhances different qualities of the stainless steel case and Longines L512 movement.

To change the strap, position the watch on a soft surface with the dial facing downwards. Using a spring bar removal tool, apply gentle pressure to the lateral attachment pins to compress the internal springs. Once compressed, the strap will disengage easily. When installing the new 25mm strap, ensure that the pins align perfectly with the case attachments and that the spring is fully inserted. If you are not experienced with this procedure, entrust the task to a professional watchmaker.

Yes, high-quality aftermarket straps compatible with the L2.640.4.78.3 are available. On milanostraps.it you will find a collection dedicated to 25mm straps, crafted by Italian artisans with excellent materials such as alligator, vegetable-tanned calf leather and shell cordovan. These straps are customisable in size, engraved initials and choice of stitching thread. The Casati Milano atelier also offers a bespoke service for custom-made straps with direct consultation.

The lifespan of a leather strap for the L2.640.4.78.3 varies based on material and usage. A quality artisanal alligator or shell cordovan lasts on average 4-6 years with daily wear, developing an elegant patina over time. Vegetable-tanned calf leather, thanks to its robustness, can last 5-7 years. Structured rubber has a similar lifespan. Factors influencing longevity include exposure to moisture, wrist perspiration and frequency of use. The Casati Milano atelier provides an 18-month warranty on all straps produced.