Zenith · El Primero

Strap for El Primero Stratos Flyback Rainbow

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

Lug width20 mm
Case diameter45 mm
Reference03.2061.405/21.M2060
FamilyEl Primero
MovementZenith caliber El Primero 405B hours, minutes, small seconds | date | Chronograph, column wheel, Flyback
Year2014
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 03.2061.405/21.M2060

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The El Primero 03.2061.405/21.M2060, seen from the bench

The Zenith El Primero 03.2061.405/21.M2060 Stratos Flyback Rainbow is the contemporary evolution of a legendary timepiece. Housed in a 45mm stainless steel case, it features the iconic Zenith Caliber El Primero 405B automatic chronograph movement with column wheel, oscillating at 36,000 vibrations per hour—the standard established since 1969. The movement includes three subdials for hours, minutes, and small seconds, plus an instantaneous flyback chronograph function. The 20mm lug width is engineered to match the case's proportions, ensuring proper strap compatibility without visual imbalance.

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