Rolex
Day-Date 36 118389-0095— lug 20mm

The lug width of the Day-Date 36 reference 118389-0095 is precisely 20 millimetres. This measurement is taken internally between the spring bars and must be respected exactly: straps of 19 or 21 millimetres will not fit correctly onto the case lugs. You can verify compatibility by measuring the distance between the two internal holes of your case using a digital calliper.

Alligator leather is the historically appropriate choice for the Day-Date 36 118389-0095. The hide exhibits a fine, uniform grain that dialogues elegantly with white gold without creating visual competition. Shell cordovan represents the premium alternative for those seeking a patina that ages distinctly over time, whilst vegetable-tanned calf offers both breathability and formal restraint. We advise against FKM rubber, as the Day-Date is not conceived as a diving instrument.

The Day-Date 36 employs fixed lugs requiring removal of the spring bars using a specialist tool and small hammer. We recommend against attempting this yourself unless you possess professional experience: the bars and lugs are machined from tempered steel, and the risk of scratching the case is substantial. Consult a master craftsman such as Casati Milano, where you may personally select the leather in the atelier and follow each phase of construction via private communication.

Yes, any quality strap manufactured to 20-millimetre lug width is compatible with the Day-Date 36 118389-0095. Compatibility depends solely on lug width, irrespective of the brand or origin of the strap. However, the strap must be crafted artisanally and free of defects: mediocre execution undermines the visual and tactile balance of a white gold timepiece. On milanostraps.it you will find 20mm straps curated from certified artisans.

A quality artisanal alligator or calf strap lasts approximately 3 to 5 years with daily wear, provided proper maintenance: avoid prolonged water immersion, protect the leather from direct heat, and apply a dedicated conditioner every 12 months. Shell cordovan is more resilient and may endure 5 to 7 years owing to the density of equine leather. The patina that develops—microabrasions and subtle fading—is not deterioration but rather a signature of time. Straps produced by Casati Milano carry an 18-month warranty against manufacturing defects and are engineered to endure with appropriate care.