Zenith · Chronomaster

Strap for El Primero Open Hero Cup

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

Reference03.20410.4061/07.C772

FamilyChronomaster

MovementZenith caliber El Primero 4061 Hours, Minutes, Small Seconds | 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 Chronomaster 03.20410.4061/07.C772

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Chronomaster 03.20410.4061/07.C772, seen from the bench

The Zenith Chronomaster 03.20410.4061/07.C772 is the contemporary evolution of one of watchmaking's most iconic chronographs. Launched in 1969, the El Primero revolutionized mechanical chronography with a frequency of 36,000 hourly alternations. This model features a stainless steel case with a 42.00 mm diameter and is powered by the El Primero 4061 automatic caliber with central column chronograph function. The lug width measures 20 mm, requiring straps and bracelets constructed with millimetric precision to ensure proper fit without lateral play.

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