Strap for Master Collection Date 47.5

The lug width of the Longines Master Collection L2.689.4.78.5 is 25 mm. This measurement refers to the internal distance between the two lateral lugs of the case and ensures the balanced proportions characteristic of this oversized model. A 25 mm strap passes without lateral play through the case attachments, maintaining the original aesthetics of the piece.

Recommended materials include alligator with vegetable tanning for maximum refinement and natural patina development; shell cordovan for a smooth, glossy surface that supports the 47.50 mm diameter; vegetable-tanned calf leather for aesthetic versatility and tactile responsiveness; silk or cotton NATO for a sporty option. The choice depends on primary use and personal preference regarding grain texture versus smooth finish.

To change the strap, obtain a spring bar tool designed for this purpose. Place the watch on a soft cloth to prevent scratches. Insert the flat tip of the tool into one of the lateral holes of the upper lug, applying gentle downward pressure to compress the internal spring. Fully extract the pin. Repeat for the opposite side. Align the new strap's holes with the case pins and reinsert the upper pin first, then the lower one. Verify the strap slides without lateral play.

Yes, any strap with a 25 mm lug width is compatible with the Longines Master Collection L2.689.4.78.5. High-quality aftermarket straps, such as those in vegetable-tanned alligator, shell cordovan, or traditionally tanned calf leather, offer superior aesthetic and tactile experience compared to standard factory straps. Ensure the leather thickness does not exceed 3-4 mm for smooth accommodation in the lugs.

A high-quality leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts 4-7 years with daily wear, provided proper maintenance. Factors affecting longevity include exposure to perspiration and humidity (reduces lifespan), seasonal rotation (extends useful life), protective treatments with natural balm (significantly increases resistance). The patina developed during use represents the mark of authenticity and construction quality, not a defect.