Zenith · El Primero

Strap for Chronomaster Open Stainless Steel / Silver / Bracelet

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
Reference03.3300.3604/69.M3300
FamilyEl Primero
MovementZenith caliber El Primero 3604 hours, minutes, small seconds | Chronograph, column wheel
Year2022
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 El Primero 03.3300.3604/69.M3300

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The El Primero 03.3300.3604/69.M3300, seen from the bench

The El Primero was introduced by Zenith in 1969 as the first automatic high-frequency chronograph movement. It is powered by the El Primero 3604 caliber with a column-wheel chronograph mechanism. It features indication of hours, minutes, small seconds and chronograph with a column-wheel mechanism.

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