Strap for Day-Date 36 Platinum Diamonds / President Diamonds / Ice Blue Computer

The lug width (misura ansa) is precisely 20mm. This measurement is specific to Day-Date 36 models of this generation and is critical to ensure seamless compatibility between the case and strap. Alternative widths would compromise both aesthetic and functional integrity.

Alligator is the natural choice for platinum: its regular grain pattern and inherent lustre complement the polished case surfaces, creating visual and tactile harmony. Vegetable-tanned calf offers a richer patina development; shell cordovan provides structural body without added weight. Selection depends on context: alligator for pure elegance, calf for aesthetic evolution, cordovan for everyday reliability.

Strap replacement requires a spring bar tool and careful technique: position the watch with lugs facing upward, insert the tool's bifurcated tip beneath the internal spring mechanism, lift with controlled pressure until the spring disengages from the case hole. Remove the old strap, align the new one to the metal lugs, reinsert the spring bars—verifying secure seating on both sides. Avoid impact against hard surfaces; professional replacement at a specialised atelier is recommended.

Any strap with 20mm lug width is theoretically compatible, provided construction quality meets rigorous standards. Milano Straps curates selections in alligator, calf, cordovan and technical rubber, each tested for fit, elasticity and material resilience. Our Casati Milano atelier enables complete customisation, allowing you to oversee every manufacturing stage.

Durability depends on usage frequency and material selection. Quality alligator achieves 3–5 years under controlled wear; vegetable-tanned calf sustains 2–4 years whilst developing desirable patina; shell cordovan, through structural rigidity, exceeds 5–6 years even with intensive use. Climate, humidity and exposure to chemicals (perfumes, perspiration) are critical factors. Casati Milano provides 18-month warranty on manufacturing defects and recommends annual maintenance cycles to extend strap lifespan.