Strap for Prestige Gold Cushion 18

The lug width (ansa width) of the Longines L4.230.7.85.6 is 20 millimetres. This measurement is the fundamental parameter for selecting compatible straps. Measure by positioning a ruler between the two external lugs of the case, without compressing any component. An incorrect lug width results in strap instability and aesthetic issues.

Black alligator represents the natural choice for this dress watch in yellow gold. The regular grain and controlled brilliance of alligator create an aesthetic harmony without conflict. Alternatively, vegetable-tanned calf offers a more pronounced texture and a patina that develops over time, ideal for those who appreciate material narrative.

Strap replacement occurs through extraction of the spring bars that connect the strap to the lugs. Use a dedicated tool (spring bar tool), available from professional watchmakers or sold separately. Position the lever under the spring bar, apply gentle pressure and the bar retracts, allowing extraction of the old strap. Repeat the procedure with the new strap. If unsure, consult a professional: the risk of damaging the yellow gold lugs is real.

Yes. Any strap with a 20-millimetre lug width is compatible with this model. Custom artisanal straps are often preferable to original Longines straps because they offer choice of materials, stitch finish, colours and personalised thread. Always verify that the supplier understands the dress aesthetic of the model and does not propose excessive thickness.

The lifespan of a leather strap depends on daily use, environmental conditions and tanning quality. A quality artisanal alligator or calf, in moderate use (3–4 days per week), maintains functionality and aesthetics for 3–5 years. Humidity, contact with salt water and thermal variations accelerate ageing. Vegetable tanning ages more visibly but often more fascinatingly. Artisanal straps with 18-month guarantee offer constructive protection.