Zenith · El Primero

Strap for El Primero Big Date Special

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

Lug width

20mm

20 mm straps All Zenith

Lug width20 mm

Case diameter42 mm

Reference03.2410.4010/21.C722

FamilyEl Primero

MovementZenith caliber El Primero 4010 Hours, Minutes, Small Seconds | Big 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

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Straps for the El Primero 03.2410.4010/21.C722

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The El Primero 03.2410.4010/21.C722, seen from the bench

The Zenith El Primero was introduced in 1969 as the first automatic high-frequency chronograph movement. It is powered by the El Primero Calibre 4010 with functions of hours, minutes, small seconds, big date and chronograph with column-wheel. The 03.2410.4010/21.C722 reference represents one of the contemporary variations of this technical collection.

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