Rolex
Day-Date 36 118206-0035— lug 20mm

The Rolex Day-Date 36 reference 118206-0035 features integrated lugs measuring 20 millimetres. This dimension is specific to this model and admits no variation. To verify aftermarket strap compatibility, measure the width at the base of the lug using a digital calliper: the measurement must fall between 19.8 and 20.2 millimetres to ensure smooth insertion without forcing.

Alligator in dark brown remains the most recommended choice, creating defined contrast with platinum whilst maintaining aesthetic coherence with the Day-Date's formal identity. Alternatively, vegetable-tanned calf offers a patina that evolves over time, ennobling with wear. Shell cordovan represents an excellent compromise between visual compactness and reflective luminosity. We advise against sports materials or rubber, which would compromise the sartorial integrity of the watch.

Changing the strap on a Day-Date 36 with integrated 20mm lugs requires precision. Procure a lug removal tool (available from professional watchmakers) and gently extract the pin from the old strap. Insert the new strap, aligning it correctly to the lug base, then reinsert the pin with calibrated pressure. We strongly recommend entrusting this operation to a professional watchmaker to avoid damage to the case, or utilising the customisation service at Casati Milano.

Any quality strap with a 20mm lug width is technically compatible with the Day-Date 36 118206-0035. However, we recommend considering: noble materials such as alligator, vegetable-tanned calf or shell cordovan; strap thickness coherent with case refinement (not exceeding 4.5mm); 20mm straps from our online catalogue, manufactured to quality standards equivalent to those of Rolex.

Durability depends upon material and daily use. A superior-quality alligator strap, worn regularly but not constantly, maintains structural integrity for 8–12 years. Vegetable-tanned calf, owing to its capacity to evolve without rapid deterioration, achieves 6–10 years of intensive wear. Shell cordovan, due to its compactness, exceeds 10 years even with constant use. Casati Milano provides an 18-month warranty against manufacturing defects for all bespoke straps.