Longines
Elegant L4.312.4.87.6— lug 20mm

The lug width (ansa width) of the Longines Elegant L4.312.4.87.6 is 20mm. This measurement is determined by the case geometry and remains constant regardless of the strap installed. To verify compatibility, measure the internal space between the lugs protruding from the case: it must correspond exactly to 20mm.

For the dress watch Elegant L4.312.4.87.6, we recommend dark brown alligator or cognac-coloured vegetable-tanned calf leather. Alligator maintains maximum formality with minimal visible aging; calf develops a natural patina that mirrors the refinement of the stainless steel case. The choice depends on primary use: leather for pure elegance, elastomer for daily durability.

Strap replacement requires a dedicated springbar tool to extract the metal pins (springbars) securing the strap to the case lugs. Insert the tool into the pin's groove, lower gently to compress the internal spring, then extract the pin downward. Repeat on the other side. Insert the new strap by reversing the operation, ensuring the pins are fully engaged in the case lugs.

Yes, any strap with a 20mm lug width is compatible with the L4.312.4.87.6. Quality aftermarket straps offer customisation in material, colour, and length, adapting to individual wrist size. Verify that the supplier specifies 20mm as the lug width and that the strap is constructed from premium leather or materials appropriate for a dress watch of this calibre.

Leather strap durability depends on usage intensity: with daily wear, a quality alligator strap lasts 4–6 years before showing visible signs of wear (minor creasing, edge discolouration); vegetable-tanned calf ages more rapidly but develops an appreciated patina, with useful life of 3–5 years; shell cordovan, being extremely dense, achieves 7–8 years of daily use. Regular maintenance—cleaning the strap and keeping it dry—significantly extends longevity.