Strap for Master Collection Date 29 Two Tone

The lug width of the Longines Master Collection L2.257.5.77.7 is 15 millimetres. This is the internal distance between the two lugs of the case, measured perpendicular to their longitudinal axis. To verify this correctly, use a digital calliper positioned inside the case without excessive pressure. Ensure you measure the internal width and not the depth of the lug.

For the L2.257.5.77.7, Nile alligator is the premium choice: the fine grain and natural texture mirror the case's constructive rigidity. Excellent alternatives include vegetable-tanned calf leather for deep patina development over time, and shell cordovan for superior natural durability and aesthetic ageing. For casual contexts, vulcanised FKM rubber in dark tones offers versatility while maintaining overall elegance.

Changing the strap on the L2.257.5.77.7 involves removing the spring bars using a dedicated tool, or applying controlled pressure with a flat blade. Place the watch on a soft cotton surface, locate the spring bar at the lower lug, push gently upward to release it, then extract the old strap. Insert the new strap by aligning the hole with the spring bar, press firmly until the locking click. Repeat for the second lug. If unfamiliar, consult a professional watchmaker or contact Casati Milano directly.

Yes, provided the aftermarket strap is specifically constructed for 15mm lug width. Milano Straps' online straps are engineered with constructive precision identical to genuine Longines straps, ensuring play-free mounting and perfect alignment with the lugs. All alligator, calf, and shell cordovan straps in the 15mm collection are certified compatible. Always verify the lug width before purchase.

The average lifespan of a premium leather strap (alligator, calf, shell cordovan) for the L2.257.5.77.7 ranges from 5 to 10 years of daily wear, depending on the leather type and environmental conditions. Nile alligator and shell cordovan, thanks to their natural density, tend towards the upper end. Vegetable tanning develops a protective patina over time, extending functionality. Excessive humidity, direct heat, or UV exposure accelerates ageing. Casati Milano straps include 18-month warranty against manufacturing defects.