Rolex
Day-Date 36 118205f-0118— lug 20mm

The Rolex Day-Date 36 ref. 118205f-0118 features a lug width of 20 millimetres. This is the precise distance between the two spring bars (lugs) on the case and represents the critical parameter for selecting any compatible strap. Measuring accurately with a digital calliper is essential to avoid mounting issues and ensure perfect fitting.

For the Day-Date 36 in rose gold, straps in alligator, shell cordovan or quality calf leather are recommended. Alligator is the traditional presidential choice, with a compact texture and characteristic iridescence that naturally dialogues with rose gold. Shell cordovan offers superior density and a patina that evolves towards amber tones. Calf leather provides flexibility whilst maintaining elegance. Each material should be paired with a proportionate buckle and ideally a deployant clasp for comfort.

The strap is replaced by removing the spring bars from the case using a specialised tool or spring bar remover. These bars must be extracted carefully to avoid damaging the case. Once removed, the old strap detaches and the new strap—in the correct 20mm lug width—slots into the lugs. The bars are then reinserted and secured. If unfamiliar with the procedure, it is advisable to consult a qualified watchmaker or book an appointment with Casati Milano.

Yes, provided the strap is engineered for a 20-millimetre lug width. Any artisanal quality strap manufactured to this specification will be compatible. It is critical to communicate the exact lug width to the maker: straps at 22mm or 18mm will not fit correctly. Casati Milano's bespoke straps are hand-cut to measure and come with an 18-month warranty against manufacturing defects.

Durability depends on the material and frequency of wear. An alligator or shell cordovan strap with vegetable tanning, worn moderately and maintained properly, typically lasts 3-5 years before showing significant wear (brittleness, cracking). Modern calf can last 2-3 years. Usage frequency and moisture exposure are determining factors. Vegetable tanning creates a natural patina over time, whilst chemically treated straps may lose elasticity more rapidly. Casati Milano provides an 18-month warranty and recommends periodic care to extend strap lifespan.