Zenith · Class

Strap for Class Sport El Primero Stainless Steel / Silver / Strap

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference03.0510.400/04.C491
FamilyClass
MovementZenith caliber El Primero 400 hours, minutes, small seconds | date | Chronograph, column wheel
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Class 03.0510.400/04.C491

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Class 03.0510.400/04.C491, seen from the bench

The Zenith Class reference 03.0510.400/04.C491 is equipped with the El Primero 400 caliber with a column-wheel chronograph function. The movement offers indication of hours, minutes, small seconds and date. The chronograph uses the traditional column-wheel architecture for the control of start, stop and reset functions.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only