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

The lug width of the Rolex Day-Date 36 reference 118348-0150 is 20 millimetres. This measurement is specific to this model and represents the distance between the two spring bar attachments on the case where the strap is fitted. It is essential to verify this dimension when purchasing a strap to avoid incompatibility with straps of other sizes (18mm or 22mm).

For a yellow gold Day-Date 36, alligator leather represents the choice with greatest aesthetic continuity: its natural geometric grain dialogues with the Oyster finish of the case. An alligator strap with vegetable tanning in cognac or deep bordeaux tones amplifies the luxurious character of the model. Vegetable-tanned calf leather offers a versatile alternative for those who prioritise tactile comfort and a developing patina over time. For less formal contexts, an aged shell cordovan provides superior structural density and longevity.

Strap replacement requires the use of a spring bar tool (specific two-ended implement): apply the tool into the lateral slots on the case to disengage the current spring bar attachments whilst keeping the watch stable. Remove the spring bars and reinsert them into the new strap, ensuring the strap enters in the correct position without forcing. Reinsert the strap into the case and verify that both attachments lock symmetrically. If you lack experience, consult a professional watchmaker to prevent damage.

Any strap with a 20 millimetre lug width is compatible with the Rolex Day-Date 36 118348-0150. We recommend artisanal straps in alligator, calf or shell cordovan with vegetable tanning to achieve superior aesthetics and durability compared to industrial products. Always verify that the width is precisely 20mm: sizes such as 18mm or 22mm will not fit correctly. The 20mm straps available online have been tested for geometric compatibility with this model.

The lifespan of an artisanal leather strap varies according to frequency of use and environmental conditions: generally, an alligator or calf strap lasts between 3 and 7 years of regular wear. Shell cordovan, thanks to its dense structure, may exceed 10 years. Longevity increases significantly if the strap is not subjected to constant humidity, prolonged sun exposure or continuous perspiration. Quality vegetable tanning allows an evolved patina over time, rendering the strap more valuable through natural ageing rather than deteriorating. Casati Milano offers an 18-month warranty against manufacturing defects and support for extended maintenance.