Strap for Day-Date 36 Everose Fluted / Oyster / Grey

The lug width of the Day-Date 36 reference 118235f-0134 is precisely 20mm. This is the specific standard for this model and must not be confused with other widths. To verify compatibility, measure the internal distance between the two lugs (pins) on which the strap rests: it must be exactly 20mm. An error of 1-2mm would result in either loose wear or inability to mount.

For a rose gold 118235f-0134, we recommend alligator in Havana tone (dark brown) or shell cordovan with vegetable tanning. These leathers create visual synergy with the warm hue of the case, developing patina and depth over time. A black box calf is the most formal choice for business contexts. Avoid excessive colour contrasts that would compete with the metal.

Changing the strap on the 118235f-0134 requires a specific tool (spring bar tool) to release the pins. Insert the bifurcated end of the tool into the lateral gaps of the pin to trigger the internal spring, then slide the pin out of the seat. Install the new strap in reverse sequence, ensuring the pin is firmly secured. If you are not experienced, entrust this to a watchmaker: the Day-Date 36 is a precious piece that does not tolerate improvisation.

An aftermarket strap with 20mm lug width is physically compatible with the 118235f-0134, provided that the passants (the small rings that hold the strap) are properly calibrated for the asymmetrical, curved shape of the Day-Date lugs. Choose an experienced craftsman who understands the peculiarities of this model. Casati Milano personally verifies every aesthetic and functional aspect, guaranteeing expert installation.

The lifespan of a leather strap depends on material quality and frequency of use. A high-quality alligator or shell cordovan with vegetable tanning resists 5-7 years in daily wear before replacement is needed. A poor-quality calf might fail in 2-3 years. Patina, natural ageing, is not a defect but a valued characteristic that adds charm. With proper care (avoid water for extended periods), longevity is significantly extended.