Strap for Day-Date 36 White Gold / Diamond / Opal-Diamond / President-Diamond

The Rolex Day-Date 36 128349RBR-0017 features a lug width of 20 mm. This is the internal distance between the vertical edges of the lateral lugs on the case. To verify, place the watch face-down and measure perpendicularly between the strap attachment points using a digital calliper. Rolex's manufacturing tolerance is ±0.1 mm, so a 20 mm strap will fit with millimetric precision to the case.

Alligator leather in dark brown or cognac remains the canonical aesthetic choice for the white gold Day-Date 36: its natural texture and colour depth amplify the case's refinement. Alternatively, vegetable-tanned calfskin offers minimalist modernity with a natural patina that evolves over time. Shell cordovan represents the most specialised frontier, offering exceptional durability and captivating colour evolution. All these materials require a 20 mm lug width and are available in formal variants with Rolex-compatible deployant clasps.

Strap replacement requires a specialised spring bar tool and meticulous care to avoid scratching the white gold case. Position the watch face-down on a soft cloth. Locate the small circular hole on the lower lug: insert the flat tip of the spring bar tool into the hole, apply steady upward pressure to disengage the internal spring, then remove the pin. Repeat for the other lug. Proceed in reverse to attach the new strap. If you wish to avoid any risk of case damage, consult a professional watchmaker or Casati Milano, who provide expert mounting services.

Yes, any strap with a 20 mm lug width is compatible. Measurement precision is critical: undersized lugs (19.8 mm) will cause lateral play and risk of watch loss; oversized lugs (20.2 mm) will not fit the case lugs. Rolex tolerates ±0.1 mm in production, so select suppliers that certify manufacturing tolerance. Casati Milano straps guarantee millimetric accuracy and compatibility certified with your case.

A quality artisanal alligator strap lasts approximately 5–7 years with daily wear, depending on sun exposure, humidity, and cleaning routine. Shell cordovan, denser and more coriaceous, extends lifespan to 7–10 years. Vegetable-tanned calfskin ages more rapidly (3–5 years) but develops a fascinating patina. Prolonged maintenance requires weekly cleaning with a non-abrasive damp cloth, bi-annual conditioning with neutral wax, and protection from excessive humidity. Casati Milano provides 18-month warranty on manufacturing defects and regeneration services for worn straps.