Strap for Day-Date 36 Yellow Gold Fluted / President Diamonds / Black Diamonds Rubies

The lug width of the Rolex Day-Date 36 118238-0405 is 20 millimetres. This measurement must be verified with a digital calliper, positioning the spring bars between the jaws. Only straps machined with 20mm holes are compatible.

For a yellow gold watch, alligator leather in cognac or natural brown is the ideal choice. Alternatively, vegetable-tanned calf offers natural patina development. Shell cordovan in black is recommended for formal wear, whilst brown rubber ensures daily versatility.

Position the watch on a soft pad. Use a spring bar removal tool to push the bar downwards from the sides. Once the bar is extracted, the strap separates. Insert the new strap, aligning the holes with the bars, and push until it clicks. Verify the bar is fully locked before wearing.

Yes, provided the lug width is exactly 20mm and the holes are compatible (diameter 1.3–1.5mm). Casati Milano manufactures bespoke straps for this model with an 18-month warranty. Online straps are immediately compatible if specified for 20mm lug width.

A quality leather strap (alligator, calf, shell cordovan) lasts typically 3–5 years with daily wear, depending on tanning and sun exposure. Vegetable-tanned leather ages better, developing patina. Casati Milano warrants 18 months against manufacturing defects; thereafter, the strap can be reconditioned.