Strap for Master Collection Power Reserve

The lug width of the Longines Master Collection L2.666.8.78.6 is 20mm. This technical specification represents the distance between the two lugs (pins) that hold the strap in place. It is essential to measure it with a digital calliper, positioning the tool perpendicular to the lug bars to ensure accuracy and compatibility with aftermarket straps.

For the rose gold Master Collection L2.666.8.78.6, we recommend alligator in dark brown or natural finish (enhances the rose tone without visual competition) or burgundy shell cordovan (develops organic patina over time). Vegetable-tanned calf leather represents the rational compromise: durable, ages elegantly, and maintains superior flexibility. For weekend use, dark grey FKM rubber offers absolute robustness.

Strap replacement requires a spring bar tool. Insert the tool's tip into the small lateral hole of the lug, gently lifting the spring mechanism until it extracts completely. Remove the lug pin, take off the old strap, and align the new strap with the lugs. Reinsert the lug pin, ensuring the spring mechanism clicks securely on both sides. Exercise maximum caution to avoid scratching the rose gold case.

Yes, any strap with 20mm lug width is compatible with the Master Collection L2.666.8.78.6, provided the lug pins are in optimal condition. It is essential to verify replacement pin quality: we recommend a sturdy spring mechanism and stainless steel construction to prevent corrosion and accelerated wear. Specialist suppliers such as Milano Straps guarantee verified compatibility and watch-grade pins.

Leather strap durability depends on material and usage patterns. Alligator and vegetable-tanned calf maintain functionality for 3–5 years with moderate daily wear (5–6 days per week). Shell cordovan, due to superior density, reaches 4–7 years. Wear is natural: the material develops creases, and stitching gradually thins. We recommend periodic maintenance with neutral conditioner and storage in cool, dry environments to slow deterioration.