Strap for Master Collection Date 42

The lug width of the Longines Master Collection L2.665.4.51.5 is 21 millimetres. This measurement is crucial for selecting an aftermarket strap: straps with a narrower (20mm) or wider (22mm) width will cause misalignment or attachment difficulties. It is always advisable to verify the measurement with a digital calliper before purchasing a strap.

For the Master Collection L2.665.4.51.5 in stainless steel, the most appropriate materials are alligator for formal occasions (natural grain, aged patina), shell cordovan for refined elegance, vegetable-tanned calf for vintage appeal, and vulcanised rubber for sporty use. The choice depends on the context and personal aesthetic preference; however, alligator remains the universal solution that enhances the proportions and character of the watch.

Changing the strap requires extracting the spring bars from the lugs of the case. Using a spring bar tool, compress the internal spring of the bar to release each end, then remove it completely. Once both bars are extracted, remove the previous strap and insert the new one, reinserting the bars from both sides until you feel the click of engagement. The procedure does not require specialised tools and can be completed in a few minutes.

Yes, the Master Collection L2.665.4.51.5 with a 21mm lug width is fully compatible with artisanal aftermarket straps of the same width. Numerous specialised craftspeople offer personalised straps in fine leather (alligator, shell cordovan, calf), with the choice of material, colour, buckle type and bespoke details. Compatibility is complete: no modifications to the case or bars are necessary.

The lifespan of a leather strap depends on the material, tanning quality and intensity of use. An alligator or shell cordovan strap of excellent craftsmanship, worn regularly (not daily), can maintain structural integrity for 4-7 years, after which it may show stitching failures or reduced flexibility. Vegetable-tanned leather tends to last slightly less but develops a more prominent patina. Vulcanised rubber typically lasts 3-5 years. Specialised craftspeople offer maintenance and reconditioning services to extend the useful life of the strap.