Rolex
Day-Date 36 118135-0098— lug 20mm

The Rolex Day-Date 36 118135-0098 has a lug width of 20 millimetres. This is the internal distance between the lugs (the attachement points on the case where the strap is secured). Do not confuse this with the case diameter (36mm): the lug width determines strap compatibility only.

For the rose gold Day-Date 36, we recommend an alligator strap with vegetable tanning or traditional curing. Black is the most formal and historically appropriate choice; cognac brown amplifies the warmth of rose gold. If you prefer a more contemporary texture, shell cordovan develops a fascinating patina over time. Consult Casati Milano specialists for a personalised choice based on your wrist and intended use.

Changing the strap requires a spring bar tool to extract the elastic pins from the case lugs. If you are not experienced, consulting a certified watchmaker is advised to prevent damage to the case. The process is straightforward for experienced users: extract the pins, remove the old strap, align the new strap with the lugs, and reinser the pins until you feel the click of engagement.

Yes, provided the strap has the correct 20mm lug width. High-quality aftermarket straps (such as those from Casati Milano) are entirely compatible with the Day-Date 36 and allow you to personalise your watch according to your aesthetic preferences. They do not affect the warranty or value of the watch.

The lifespan of a leather strap depends on the quality of the tannery, the type of leather, and frequency of use. A high-quality alligator or cordovan strap with vegetable tanning typically lasts 3–5 years with daily wear. Calf leather may last 2–4 years. The patina that develops is part of the aesthetic charm. Casati Milano guarantees 18 months against manufacturing defects; periodic maintenance (cleaning and conditioning) extends the strap's life.