Longines
Lyre L4.960.2.12.7— lug 20mm

The lug width of the Longines Lyre L4.960.2.12.7 is 20mm. This dimension refers to the distance between the two lugs of the case, which is the critical measurement for strap compatibility. It is essential to measure this accurately using a digital calliper: position the new strap in the space between the lugs and verify that it fits perfectly without lateral play. Even a minor variation (19mm or 21mm) will result in imprecise fit and potential micro-deformations to the case.

The best strap depends on intended use and aesthetic preference. For maximum elegance, we recommend alligator in vegetable tanning (dark brown or hazelnut) which develops a natural patina over time. Shell cordovan offers extraordinary luminosity and superior durability. Smooth calf leather (black box calf or natural colour) guarantees pure minimalism, perfect for formal settings. For versatility, a NATO in mercerised cotton or vegetable-tanned calf in cognac colour. Your choice should reflect the dial: if silver satin, opt for dark brown alligator; if grey gradient, hazelnut alligator or burgundy cordovan.

Strap replacement requires a specific tool: a spring bar removal tool or thin flathead screwdriver. First, place the watch on a soft surface (microfibre cloth). Locate the small lateral hole on each lug where the spring bar sits. Insert the screwdriver or tool's flat end into the hole, apply gentle downward pressure to retract the internal spring, then carefully extract the old strap. Clean the lugs with a dry cloth. Insert the new strap, aligning the holes perfectly with the lugs, then release pressure so the spring returns to its original position. Verify that the strap sits securely on both sides.

Yes, quality aftermarket straps are fully compatible. The 20mm lug width is a recognised standard; straps from specialist manufacturers (such as milanostraps.it) are fabricated to precise specifications. The key is to verify that the manufacturer certifies the exact measurement (20mm) and uses standard-quality spring bars. Beware of very inexpensive straps that may present loose construction tolerances. A good aftermarket strap can exceed the quality of the manufacturer's original offering, providing access to premium materials (natural alligator, shell cordovan, vegetable-tanned leathers) unavailable in standard variations.

The lifespan of a leather strap depends on material, treatment, and intensity of use. High-quality vegetable-tanned alligator worn daily typically lasts 3–5 years before replacement, developing a desirable natural patina in the process. Shell cordovan, thanks to its dense fibrous structure, can last 5–7 years with proper care. Smooth vegetable-tanned calf has a similar lifespan to alligator (3–5 years). To extend strap longevity: 1) remove the watch during night hours; 2) avoid prolonged direct moisture exposure (rain, shower); 3) occasionally apply a light protective treatment (natural wax or leather-specific oil); 4) do not excessively flex the strap when unworn. Occasional use significantly extends lifespan.