Rolex
Day-Date 36 118238-0420— lug 20mm

The Day-Date 36 reference 118238-0420 features a lug width of precisely 20 millimetres, measured from the inner edges of the spring bar attachment points. This dimension is model-specific and ensures compatibility with aftermarket straps specifically engineered for 20mm lugs.

Black or brown alligator provides refined contrast and formal aesthetics. Vegetable-tanned calf develops a patina that ages in parallel with the gold. Shell cordovan in cognac or burgundy tones introduces natural luminosity. For summer wear, khaki canvas NATO or vulcanised rubber guarantee practicality without aesthetic compromise.

Obtain a spring bar removal tool in satin steel. Position the watch with the strap facing downward, insert the pointed tip beneath the metal pin attachment, apply gentle downward pressure until the internal spring releases, and remove the pin. Repeat on the opposite lug. Insert the new pins through the strap and into the case holes, pushing until you feel the spring mechanism reset.

Yes, completely. Any strap with a 20-millimetre lug width, manufactured to correct constructional standards, will fit with millimetre-level tolerances. Always verify the strap is explicitly labelled for 20mm lugs and that the supplier—such as Casati Milano—guarantees certified manufacturing quality.

A quality alligator strap, worn daily under normal conditions, lasts typically 3–5 years. Vegetable-tanned calf, less resistant to moisture, has a lifespan of 2–4 years. Shell cordovan can last 4–6 years due to its density. Duration depends on perspiration, humidity, frequency of wear and preventative care. Casati Milano offers an 18-month guarantee against manufacturing defects.