Strap for Master Collection Power Reserve

The lug width of the Longines Master Collection L2.666.4.51.7 is 20mm. This measurement, also referred to as strap width, represents the distance between the two lugs connecting the case to the strap. A 20mm lug width is an intermediate standard that ensures broad compatibility with quality aftermarket straps while maintaining balanced proportions on the wrist for a 42mm diameter case.

The best strap for the Master Collection L2.666.4.51.7 depends on intended use and personal aesthetic preference. For formal contexts, a natural alligator strap with regular grain texture emphasises the case's elegance. For daily versatility, vegetable-tanned calf leather offers supple texture and fascinating chromatic evolution. A NATO strap in cotton with tinted thread transforms the Master Collection into a casual instrument without compromising stylistic coherence. FKM rubber, conversely, is ideal for those desiring subtle sportive character.

To change the strap on the Master Collection L2.666.4.51.7, you must remove the spring bars securing the strap to the case. Using a dedicated tool, such as a spring bar tool, gently press the mechanism to release the bar. Extract the bar from both the case and the old strap, then insert the new bars into the replacement strap and secure them firmly to the case lugs. Ensure proper alignment before wearing the watch.

Yes, the Master Collection L2.666.4.51.7 is fully compatible with quality aftermarket straps designed for a 20mm lug width. The stainless steel case and lug structure accommodate leather, textile, rubber and other materials, provided the width measures 20mm. Premium artisanal straps in alligator, vegetable-tanned calf and shell cordovan represent excellent options that enhance the watch's formal nature and can be personalised with initials, stitching thread selection and bespoke measurements.

Leather strap lifespan depends on material quality, frequency of use and maintenance. A premium alligator or shell cordovan strap with vegetable tanning typically lasts 3-5 years under regular use, thanks to the natural fibre's resilience. Calf leather has a slightly shorter lifespan of 2-4 years, as the fibre is more delicate. The patina developing over time imparts character to the strap, though it gradually thins the structure. Proper care—avoiding prolonged exposure to humidity and direct sunlight—significantly extends strap longevity.