Zenith · Defy
Strap for Defy El Primero 21 Titanium / Skeleton / Bracelet
Takes 23 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
The Defy 95.9000.9004/78.M9000, seen from the bench
Frequently asked questions
What is the lug width of the Zenith Defy 95.9000.9004/78.M9000?
The lug width (spring bar distance) of the Zenith Defy 95.9000.9004/78.M9000 is 23mm. This non-standard dimension requires bespoke straps specifically constructed for this attachment. 20mm or 22mm straps cannot be adapted without compromising the fit between the lugs and the strap.
Which strap pairs best with the Zenith Defy 95.9000.9004/78.M9000?
The Zenith Defy, thanks to its contemporary geometry and titanium case, accommodates both formal and sports straps. A grained alligator leather in black emphasises the tech-chic character; vegetable-tanned calf leather with patina plays on the artisanal-versus-futuristic dichotomy; a reinforced nylon NATO strap in tactical configurations highlights the instrumental vocation. Choice depends on context: formal, casual, or outdoor use.
How do I change the strap on the Zenith Defy 95.9000.9004/78.M9000?
The strap is replaced by extracting the spring bars (the spring-loaded pins that affix the strap to the case lugs). For the Defy's 23mm lugs, a spring bar removal tool suffices: press on one side of the lug to release the spring, then extract. The new 23mm strap is inserted by aligning the lug holes with the spring bars until they click into place. The operation demands care: whilst titanium is durable, the spring bars are precision components.
Can I use an aftermarket strap compatible with the Zenith Defy 95.9000.9004/78.M9000?
Yes, provided it is specifically constructed for the 23mm lug width. Quality artisanal aftermarket straps (such as those offered by MilanoStraps) are fabricated to the same tolerance and material standards as original Zenith straps. Compatibility is assured if the strap is constructed for 23mm; material quality (leather, rubber, textile) affects durability and aesthetic ageing over time.
How long does a leather strap last on the Zenith Defy 95.9000.9004/78.M9000?
A premium leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 4–6 years with daily wear and ordinary care. Factors affecting longevity: exposure to sunlight, moisture, perspiration and cleaning frequency. A reinforced nylon NATO strap, more resistant, may last 7–10 years. The Casati Milano atelier provides an 18-month warranty on all bespoke straps, with maintenance and reconditioning options available.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only