Strap for Day-Date 36 White Gold Diamonds / Oyster / Blue

The lug width of the Rolex Day-Date 36 reference 118389-0125 is 20 mm. This dimension is determined by the width of the spring bar aperture and represents the physical space available between the two metal lugs of the case. You can verify this independently by measuring with a calliper the external distance between the lugs at the 12 and 6 o'clock positions. This measurement is not interchangeable and ensures compatibility with the entire catalogue of 20 mm straps.

For the Day-Date 36 in white gold, alligator remains the most traditional and authoritative choice: the uniform scales generate a discrete optical texture that captures light elegantly. Dark brown alligator (nearly black in backlighting) offers maximum versatility, transitioning seamlessly from a business context to a formal dinner. Alternatively, vegetable-tanned calf leather offers a natural patina that develops over time, whilst shell cordovan guarantees extraordinary durability and a silky hand feel. For more dynamic environments, vulcanised rubber or technical NATO textile offers a contemporary casual interpretation coherent with the white gold colour palette.

Strap replacement requires minimal tools: a spring bar tool (lever) and a stable, well-lit work surface. Position the watch with the strap facing upwards and insert the flat tip of the spring bar tool under the metal lug pin at one end of the strap, applying gentle pressure to compress the pin and release the spring hole. Extract the pin completely, then repeat from the other end. Conversely, seat the new strap by inserting the pins into the receptacles provided by the case. Avoid sharp impacts or excessive twisting that could damage the pins. If you are not experienced with the procedure, Casati Milano offers replacement service at the Milan atelier, with direct guidance on leather selection.

20 mm straps are compatible with many Rolex models with a case diameter between 36 and 40 mm that utilise the same lug width, such as the Datejust, vintage GMT-Master II and early Seventies Submariner. However, mechanical compatibility does not automatically imply aesthetic coherence: the Day-Date 36 in white gold, by proportion and visual language, requires a strap of artisanal quality that respects the formal standards of its genealogy. A strap custom-made by Casati Milano guarantees not only physical compatibility, but also stylistic harmony with your specific case.

The lifespan of a leather strap depends on multiple factors: the type of leather (alligator, calf, cordovan), the daily wear regime, exposure to humidity, perspiration and UV rays, and conservative maintenance. An alligator subjected to discrete formal use and regular maintenance (periodic cleaning, light conditioning) can last three to five years. Vegetable-tanned calf tends to develop patina more rapidly, often appreciable within six to twelve months, and remains functionally intact for four to six years. Shell cordovan, thanks to its density and intrinsic resistance, can exceed ten years. Casati Milano provides artisanal straps with an 18-month warranty against manufacturing defects, also supporting the customer throughout the strap's lifespan through repair and finishing services.