Strap for Day-Date 36 Yellow Gold Diamonds / Oyster / Paved Roman

The lug width of the Rolex Day-Date 36 ref. 118348-0226 is 20 millimetres. This measurement represents the internal space between the case lugs and is standard across all modern production Day-Date 36 models. Any replacement strap must precisely comply with this 20mm specification, with a maximum tolerance of ±0.3mm to prevent lateral play during wear.

Alligator leather represents the formal choice of preference for the yellow gold Day-Date 36, owing to its natural texture and the patina development over time, creating perfect visual synergy with the precious metal. Mississippi alligator with fine grain is ideal for boardroom contexts, whilst Nile alligator offers a slightly more pronounced aesthetic. For alternative versatility, shell cordovan guarantees superior durability and understated aesthetics, developing a noble patina over years of use. Vegetable-tanned calf leather provides an intermediate option, maintaining formality whilst permitting natural patina development.

Strap replacement on the Day-Date 36 is achieved through removal of the spring bars connecting the case lugs to the current strap. Using a dedicated spring bar removal tool or a thin instrument, compress the spring bar from within the lug, freeing the current strap's end. Repeat on the opposite lug, then insert the new strap by aligning its ends with the lug holes and pressing the spring bars into position. To avoid the risk of case damage, we recommend consulting a professional watchmaker or our Casati Milano atelier for this procedure.

Yes, the Day-Date 36 ref. 118348-0226 accepts any high-quality aftermarket or artisanal strap with precise 20mm lug width. Aftermarket straps represent an extraordinary opportunity to personalise the timepiece, selecting exclusive materials—alligator, cordovan, vegetable-tanned calf—that Rolex does not offer as standard. We recommend verifying that the strap is crafted by specialised artisans, with precise construction tolerances and finishing compatible with the model's inherent elegance.

The durability of a leather strap depends upon construction quality, material selection, and use intensity. A high-quality alligator or cordovan strap, crafted with vegetable tanning, guarantees 4–6 years of daily wear before replacement is necessary, whilst developing an increasingly noble patina. Lower-grade calf leather may require replacement after 2–3 years. Prolonged exposure to humidity, perspiration, and UV radiation shortens durability; regular maintenance using natural balms and storage in dry environments significantly extend strap lifespan. The 18-month warranty on manufacturing defects offered by Casati Milano provides protection against construction faults.