Zenith
El Primero 03.2040.400/53.R576— lug 21mm
Zenith El Primero 03.2040.400/53.R576: 21mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 21mm lug width to preserve the original sartorial balance."
Technical Specifications
Zenith 03.2040.400/53.R576The essential strap measurement.
Browse 21mm straps →03.2040.400/53.R576
Zenith caliber El Primero 400B Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel
The Heritage
Compatible Straps
Selected for the 21mm lug width of the El Primero
FAQ
What is the exact lug width of the Zenith El Primero 03.2040.400/53.R576?
The lug width of the Zenith El Primero 03.2040.400/53.R576 is 21mm. This measurement is specific to this model and requires straps manufactured with millimetre precision. To verify compatibility, measure the distance between the two strap holes: it must correspond exactly to 21mm.
Which strap material is most suitable for the Zenith El Primero 03.2040.400/53.R576?
Alligator with vegetable tanning is the most appropriate choice, thanks to its regular grain that ages gracefully with controlled patina. Alternatively, calf leather with vegetable tanning offers sobriety and colour that deepens over time. For a contemporary sports approach, a nylon-cotton NATO or FKM rubber maintains the technical character of the instrument.
How do I change the strap on my Zenith El Primero 03.2040.400/53.R576?
Strap replacement is achieved by extracting the spring bars that connect the strap to the case. Equip yourself with a spring bar tool and a soft base to protect the dial. Extract one spring bar at a time, remove the old strap, insert the new one, and reinsert the spring bars. If you are unfamiliar with the process, consult a professional.
Can I use aftermarket straps compatible with the Zenith El Primero 03.2040.400/53.R576?
Yes, 21mm aftermarket straps are fully compatible. Ensure that the lug width corresponds exactly and that the strap is constructed with appropriate craftsmanship. You will find ready-to-ship straps online; for a personalised experience, Casati Milano creates bespoke straps with an 18-month warranty.
How long does a leather strap last on a Zenith El Primero 03.2040.400/53.R576?
The lifespan of a leather strap depends on the material and usage. Alligator and calf leather with vegetable tanning last 5–10 years with regular maintenance (water protection, regular drying). Thinner or non-vegetable tanned leathers may wear within 2–3 years. The Casati Milano warranty on bespoke straps is 18 months for manufacturing defects.
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 →By appointment only · Milan
The atelier's website: casatimilano.com