Longines
Heritage L2.310.4.12.0— lug 18mm

The lug width of the Longines Heritage L2.310.4.12.0 measures 18 millimetres. This specific measurement refers to the internal distance between the lugs on the case. To verify it correctly, use a digital calliper or ruler positioned perpendicularly between the two lugs, without forcing contact.

For the 18mm lug width, we recommend alligator or shell cordovan for refined aesthetics, or full-grain leather with vegetable tanning for daily versatility. The narrow width enhances the natural grain of the leather. Avoid silicone or overly thick rubber straps, which would unbalance the proportions of the 36mm case.

Remove the watch from your wrist. Use a spring bar tool or flat-head screwdriver to gently lever the elastic spring bars on the case, one at a time. Fully extract the old strap, then insert the new one by clicking the spring bars into their housings. Verify it is secure before wearing the watch.

Yes, provided it is of certified quality. All 18mm straps are compatible, regardless of brand. We recommend choosing high-level leathers (certified alligator, cordovan, vegetable-tanned calf) to avoid compromising the watch's aesthetics and value. Milanostraps offers artisan 18mm straps ready for shipment.

A quality leather strap has an average lifespan of 3–5 years with daily use, depending on climate, perspiration, and care. Vegetable-tanned leather ages more visibly but remains functional. Cordovan lasts longer, up to 7–8 years. Alligator, if protected from moisture and heat, easily exceeds 5 years. Casati Milano guarantees 18 months on its artisan work.