Strap for Day-Date 36 Yellow Gold Diamonds / President Diamonds / Champagne Roman

The Rolex Day-Date 36, reference 118348-0132, features a lug width of 20 millimetres. This dimension is specific to this model and is determined by the case shoulder geometry and pin attachment positioning. To verify, place a digital calliper between the inner points of the lugs: the result must be exactly 20mm. Respecting this precise measurement is essential, as a slightly narrower or wider strap would compromise fit and compromise the mechanical integrity of the pins over time.

For the yellow gold Day-Date 36, black alligator is the canonical choice, thanks to its symmetrical grain and chromatic contrast that amplifies the luminosity of the metal. Alternatively, shell cordovan subjected to vegetable tanning develops sophisticated patina over time, creating aesthetic evolution parallel to the ageing of gold. Smooth vegetable-waxed calf leather offers formal versatility, whilst cognac brown in alligator engages in warm-on-warm harmony. Avoid sports straps or rubber, which would alter the presidential character of the model.

Changing the strap requires minimal tools: a spring bar tool (small double-blade screwdriver) and a stable work surface. Position the watch face-down, insert the tool blade into the hole of the lower lug shoulder, push outward until the metal pin releases, remove the old strap. Repeat from the opposite shoulder. When inserting the new strap, align the strap holes with the pins, insert one spring bar at the end, ensure both sides are secured symmetrically. Avoid excessive pressure, which could scratch the gold case.

Only straps constructed with a 20-millimetre lug width are compatible. On the market, finding straps of this width requires specialist craftspeople, as most industrial production concentrates on 18, 20, 22 and 24mm. Italian artisanal straps, particularly those made in alligator or shell cordovan with vegetable tanning, guarantee robust construction and predictable aesthetic ageing. Avoid generic straps labelled as "universal": mechanical and aesthetic compatibility depends on millimetre precision.

The lifespan of a leather strap depends on frequency of use, climatic conditions and material. High-quality artisanal alligator or shell cordovan, subjected to vegetable tanning and maintained under normal conditions (daily wear, natural drying), lasts on average 3–5 years. Smooth calf leather is more subject to aesthetic wear—minor creasing and uneven patina—within 2–3 years. Prolonged exposure to humidity, salty perspiration and heat sources accelerates deterioration. Casati Milano straps carry an 18-month warranty on manufacturing defects; periodic maintenance with natural creams significantly extends useful life.