Strap for Defy El Primero 21 Ultraviolet

The lug width of the Zenith Defy 97.9001.9004/80.R922 is 23 millimetres. This intermediate dimension was selected by the designer to maintain proportional balance between the 44mm case diameter and overall thickness. To verify compatibility, measure the internal distance between the two case lugs using a digital calliper with precision to one tenth of a millimetre.

For this titanium case, we recommend alligator leather with vegetable tanning in cognac or black, which accentuates the linear architecture through geometric texture contrast. Alternatively, structured calf with pullup finish offers the natural chromatic evolution that parallels titanium ageing. For more dynamic contexts, shell cordovan provides exceptional durability whilst maintaining sophisticated appeal.

Strap replacement is performed by removing the bayonet lugs on the case. Using a spring bar tool, insert the tip into the lateral slot of the lug to release the internal spring, thereby extracting the metal bars. Position the new strap lugs in the case attachments and engage the spring until fully locked. Verify that the strap presents no lateral play.

All straps with a 23-millimetre lug width are compatible with the Zenith Defy 97.9001.9004/80.R922. On milanostraps.it you will find a curated selection of straps in various noble leathers, workmanships and finishes, customisable in length, initials and stitching thread choice. The Casati Milano atelier additionally offers bespoke creation with direct consultation on leather selection.

The lifespan of a leather strap depends on tanning quality, specific material and usage patterns. A superior alligator or shell cordovan typically resists 5-7 years with ordinary maintenance (occasional cleaning and rapid drying after humidity exposure). Structured calf varies between 3-5 years, whilst more delicate leather may require replacement every 2-3 years. Avoid prolonged exposure to water, humidity and direct heat to maximise longevity.