Strap for Defy 21 Ultra Colour Green

The lug width is 23mm, measured from the inside of the lower attachment seat to the upper lug bar. This unusual dimension, outside standard industrial tolerances, reflects Zenith's artisanal construction philosophy and requires purpose-built straps to prevent lateral play damaging the titanium case.

To enhance the geometric and constructive character of the model, we recommend a Nile alligator strap with vegetable tanning, where the grain echoes the angular case architecture. Alternatively, hand-finished Taurillon calf with vintage wash creates a compelling tactile contrast. For sport applications, a tightly-woven cotton Jacquard NATO offers versatility without aesthetic compromise.

The Defy employs standard 23mm spring bars. Use a dedicated strap remover tool to depressurise the spring-bars from the lower seat, lifting gently from vertical. Never force horizontally: titanium scratches easily. Insert the new strap by aligning the holes perfectly with the lugs before re-securing the spring bars, verifying engagement with gentle vertical pressure.

Yes. Any professional strap with 23mm lug width is compatible. Milano Straps offers bespoke leather straps (alligatore, Taurillon, shell cordovan) and technical straps (NATO, FKM) in 23mm, handcrafted with structural quality control to prevent lateral movement. Coverage includes 18 months from delivery.

Longevity depends on tanning method and usage intensity. A vegetable-tanned alligator or Taurillon calf strap endures 4-6 years with moderate daily wear, developing characteristic patina. Excessive moisture and prolonged sweat contact accelerate ageing. Shell cordovan, being denser, may last 7-8 years. Periodic maintenance with natural wax significantly extends useful life.