Strap for Defy 21 Ultra Colour Khaki

The Zenith Defy 97.9001.9004/80.R945.T3/P features a 23-millimetre lug width. This measurement represents the internal distance between the two lateral lugs of the titanium case. To verify strap compatibility, measure this distance with a digital calliper: any 22 or 24-millimetre strap would result in unacceptable mechanical play.

Choice depends on intended use. For a contemporary elegant interpretation, polished black alligator creates maximum chromatic contrast against titanium. If the Defy is a daily tool, chrome-tanned calf offers comfort and immediate flexibility. Shell cordovan guarantees patina development over time and exceptional durability. For sporting or humid environments, NATO or FKM rubber straps maintain functional purpose.

The Defy uses standard straps with 23mm lug width. Position the watch on a soft surface. Remove the pass-through pins (the metal bars connecting the strap to the case) using a dedicated removal tool: one end extracts, the other reinserts. Work from inside to outside, position the new strap, then reinsert the pins from the opposite side. To avoid risk, entrust the operation to Casati Milano atelier.

Yes, provided the lug width is 23 millimetres. Any strap manufactured for 23mm lugs is compatible: alligator, calf, shell cordovan, canvas, technical rubber. Absolutely avoid 22 or 24-millimetre lugs, as they would cause lateral play. Milano Straps offers 23mm straps ready to ship or bespoke options from Casati Milano atelier.

Durability varies depending on material and usage. Chrome-tanned calf strap has an average lifespan of 3–5 years with moderate daily wear. Shell cordovan, thanks to dense fibre structure and vegetable tanning, reaches 7–10 years whilst retaining elasticity. Alligator, if vegetable-tanned, lasts 5–8 years. Milano Straps guarantees 18 months on all bespoke straps made by Casati Milano atelier, covering manufacturing defects and premature stitch failure.