Strap for Day-Date 36 Platinum Diamonds / President / Black Diamonds

The lug width of the Rolex Day-Date 36 118346-0065 is 20 millimetres. This parameter represents the standard strap width and is measured between the horizontal pins that connect the strap to the case. It is essential to respect this measurement when selecting an aftermarket strap, as even minor variations (19 or 21mm) would cause visual misalignments or unwanted micro-movements.

For a platinum Day-Date 36, alligator in vegetable tanning represents the most natural choice: its uniform grain texture amplifies the case's authority. Burgundy shell cordovan constitutes an excellent alternative for those preferring a more lustrous finish. Thick calf (minimum 1.4mm) in black or blue tones remains valid, as does satin rubber for those desiring daily practicality without aesthetic compromise.

Changing the strap on a Day-Date 36 requires a spring bar tool (specific implement with two flat tips). Insert the tool into the lateral recess of the lug, apply gentle pressure to compress the internal spring, and extract the horizontal pin. Repeat on the other side. Insert the new strap by aligning the holes at the height of the pins, then press them until the locking click is felt. Never force: if the pin does not enter smoothly, verify the strap's alignment.

Yes, provided they strictly respect the 20-millimetre lug width and feature 2.5-millimetre diameter horizontal pins (Rolex standard). A high-quality aftermarket strap, crafted in alligator, cordovan or vegetable-tanned calf, does not compromise the watch's integrity or value in any way. Selecting a personalised strap allows you to modulate style whilst keeping the watch unaltered.

The longevity of a leather strap depends on usage intensity and material. Quality alligator or shell cordovan, worn daily and treated with periodic conditioning, maintains structural integrity for 5–8 years. Vegetable-tanned calf tends to wear more quickly (3–5 years), whilst rubber can last 10+ years without significant degradation. Prolonged exposure to moisture, heat and perspiration accelerates ageing. Casati Milano offers an 18-month guarantee on manufacturing defects.