Zenith · Defy
Strap for Defy El Primero 21 Chroma
Takes 23 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
The Defy 49.9010.9004/01.R947, seen from the bench
Frequently asked questions
What is the lug width of the Zenith Defy 49.9010.9004/01.R947?
The Zenith Defy 49.9010.9004/01.R947 features a lug width of 23 millimetres. This measurement is specific to this model and is determined by the distance between the two lugs of the titanium and ceramic case. It is essential to use straps designed specifically for this width, as even minor variations (22mm or 24mm) compromise fit and final aesthetics.
Which strap is most suitable for the Zenith Defy 49.9010.9004/01.R947?
The ideal strap for the Defy depends on usage context and personal preferences. An alligator strap with vegetable tanning delivers formal elegance and creates an engaging contrast with the ceramic case; a coloured calf leather offers softness and refinement; a NATO strap in quality cotton/polyester provides practicality and stylistic versatility. Your choice reflects the balance between the watch's audacious aesthetic and your personal code of style.
How do you change the strap on a Zenith Defy?
The Zenith Defy strap is changed using a spring bar removal tool. Position the watch on a stable surface, insert the tool's tip into the gap between the lug and strap, apply gentle outward pressure to release the spring bar on the first side, then repeat on the other side. Once the spring bars are removed, slide off the old strap and insert the new one, ensuring the spring bars are fully seated.
What aftermarket straps are compatible with the 49.9010.9004/01.R947?
The Zenith Defy requires high-quality aftermarket straps created for the 23mm lug width. Milano Straps offers a complete selection of 23mm-compatible straps in alligator, calf, NATO and rubber, customisable in exact sizes, initials and stitching style. The Casati Milano atelier also creates bespoke straps with personalised consultation, direct leather selection and 18-month warranty.
How long does a leather strap last on a Zenith Defy?
Leather strap durability depends on material quality, frequency of use and care. A high-quality alligator or calf strap, worn regularly (3–4 days weekly), maintains functional and aesthetic characteristics for 4–6 years. Vegetable-tanned leather develops a natural patina that adds chromatic depth over time. Storing the watch in a dry location, avoiding prolonged immersion and rotating between multiple straps significantly extends longevity.
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