Strap for Defy Double Tourbillon Sapphire

The lug width of the Zenith Defy 04.9000.9020/00.R920 is 23 millimetres. This non-standard dimension requires specifically sized straps: not all 22 or 24 millimetre straps will be compatible due to manufacturing tolerance. We recommend always verifying the technical specifications provided by the manufacturer or contacting us directly to confirm compatibility before purchase.

Given the fully transparent sapphire case, we recommend natural alligator (light brown, grey) for soft contrast, or calf leather with vegetable tanning that develops patina over time. For sports use, vulcanised rubber (black, anthracite) offers practicality and neutral aesthetics. Shell cordovan is inadvisable for extended wear due to its natural curvature, which could create micro-gaps at the attachments. Avoid very light straps (beige, off-white) that would create visual conflict with the transparent crystal.

Place the watch on a soft, stable surface. Use a spring bar tool, inserting the tip into the groove of the pin. Apply steady, gentle downward pressure to release the spring, then extract the pin. Repeat on the other side. Insert the new strap by aligning the holes with the lugs, then reposition the pin by pressing until it clicks into place. Ensure the strap is perfectly aligned before wearing the watch. For non-standard 23mm lugs, tolerance is critical: if you encounter difficulty, consulting a professional is advisable.

Yes, the Milano Straps collection offers certified quality aftermarket straps, customisable in sizing, initials, and stitching thread. All 23mm straps are tested on Zenith Defy models to ensure fit and durability. You can select from materials (alligator, calf, rubber, shell cordovan) and colourways that complement the transparent case aesthetic. Contact the Casati Milano atelier for bespoke solutions featuring hand-selected leathers and 18-month warranty.

A quality leather strap (alligator or vegetable-tanned calf) retains structural integrity for 3–5 years of daily use, especially with regular maintenance (neutral cleaner, drying, biannual conditioning). Longevity is influenced by climate (humidity accelerates degradation), frequency of wear, direct sun exposure, and initial tanning quality. The Zenith Defy's sapphire construction does not affect strap lifespan. Vulcanised rubber typically lasts 5–7 years before showing permanent stiffening. We recommend acquiring a replacement strap to preserve your investment and vary the aesthetic.