Strap for Day-Date 40 Platinum - Fluted / Blue Ombré

The lug width is 20mm, measured as the internal space between the case lugs. This dimension is specific to the Day-Date 40 and must not be confused with the 19mm on earlier models. Correct measurement is performed with a digital calliper, positioned between the metal lugs that accommodate the strap.

Alligator and shell cordovan are the most appropriate materials. Alligator offers geometric grain and restrained elegance; shell cordovan adds patina development and tactile narrative. Both with vegetable tanning ensure longevity and controlled ageing. Anilline calf in neutral tones represents a versatile alternative for daily wear.

The procedure requires specific tools (spring bar plier, nylon mallet) and manual precision. Process: remove the lugs from the case via calibrated lateral pressure, extract the old strap, insert the new one aligning its thickness to the case slots, reinsert the lugs with symmetrical pressure. We recommend entrusting this operation to an expert to avoid case damage.

Yes, provided it strictly respects the 20mm lug width and the correct lug height (approximately 5-6mm). Undersized straps (19.5mm) cause mechanical play and accelerated wear; oversized ones (20.5mm) do not enter the slot or generate structural tension. Compatibility requires very tight tolerances.

With moderate daily use, a quality artisanal alligator or shell cordovan strap lasts 3-5 years. Anilline calf tends towards 2-3 years due to sensitivity to UV rays and humidity. Duration depends on environment, solar exposure, frequency of wear and maintenance (regular cleaning, drying after rain). UV protection and seasonal rotation significantly extend strap life.