Strap for Master Collection Power Reserve

The lug width of the Longines Master Collection L2.666.4.78.3 is 20 millimetres. This measurement is determined by the lugs on the case and must correspond precisely to the spring bar attachment points. Verifying this measurement is essential before purchasing an aftermarket strap.

For the Master Collection L2.666.4.78.3, alligator straps are recommended for formal contexts, vegetable-tanned calf leather for elegant daily wear, or canvas NATO straps for casual styling. The choice depends on use case: cognac or black alligator offers maximum versatility and noble ageing, whilst vegetable-tanned calf ensures softness and aesthetic uniqueness.

Changing the strap is a straightforward operation: position the watch securely, locate the spring bar attachment points beneath the lugs, use a dedicated tool (strap spreader or small flat screwdriver) to compress the pin and slide it out of its seat. Repeat for both sides, then insert the new strap's pins into the case lugs until they click into place.

Yes, any strap with a 20 millimetre lug width is compatible with the L2.666.4.78.3. Quality aftermarket straps in alligator, calf, cordura or rubber fit perfectly without requiring case modifications. Milano Straps provides a complete collection of 20mm straps tested for compatibility with Longines models of this generation.

The lifespan of a leather strap depends on the tanning quality, daily use and environmental conditions. A high-quality alligator or calf strap typically lasts 3-5 years with regular wear, developing a pleasant patina. Vegetable-tanned straps age more rapidly but in a controlled manner, whilst vulcanised rubber straps offer durability of up to 7-10 years. Rotating between multiple straps significantly extends the life of each one.