Zenith · Chronomaster Sport

Strap for Chronomaster Sport Stainless Steel / Black / Rubber

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 diameter41 mm

Reference03.3100.3600/21.R951

FamilyChronomaster Sport

MovementZenith caliber El Primero 3600 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel

CaseCeramic, Stainless 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 Sport 03.3100.3600/21.R951

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Chronomaster Sport 03.3100.3600/21.R951, seen from the bench

The Zenith Chronomaster Sport 03.3100.3600/21.R951 is the contemporary evolution of the El Primero, the first automatic chronograph launched in 1969. This 41mm case combines stainless steel and ceramic for scratch resistance and durability. Powered by the El Primero 3600 calibre with 36,000 vibrations per hour (10 Hz), it measures tenths of a second with precision. The 20mm lug width integrates perfectly with the 41mm case proportions, maintaining the original design harmony.

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