Strap for Day-Date 40 Yellow Gold / White - Roman

The lug width is exactly 20 millimetres. This dimension is specific to the Day-Date 40 and represents the distance between the two lug shoulders on the watch case. Every strap destined for this model must strictly comply with 20mm to ensure secure attachment and correct fit.

For a Day-Date 40 in 18k yellow gold, alligator leather with vegetable tanning represents the most elegant choice. The regular grain texture creates a noble visual contrast against the gold's lustre. Alternatively, smooth calf leather conveys formal restraint, whilst shell cordovan develops a patina over time, creating a unique aesthetic memory.

Strap replacement requires a spring bar tool, a dedicated instrument that allows gentle compression of the spring bar (small spring at the lug extremities). Position the tool beneath the lug shoulder, apply light pressure to lower the spring, and remove the lug from the case. Repeat from the opposite side. Exercise caution to avoid scratching the case during operation.

Yes, provided it respects the 20-millimetre lug width and the strap width aligns with the proportions of the 40mm case. High-quality aftermarket straps, crafted from noble materials such as alligator or calf, offer aesthetic personalisation without compromising functionality or security, provided construction is rigorous.

A quality leather strap, properly maintained, typically lasts 3–5 years with daily wear. Durability depends on tanning type: vegetable tanning tends to age elegantly, developing patina, whilst synthetic tanning may become rigid over time. Moisture, perspiration, and direct sun exposure accelerate wear. Regular maintenance—gentle cleaning, thorough drying—extends service life.