Zenith · Chronomaster Original
Strap for Chronomaster Original Triple Calendar Stainless Steel / Lapis Lazuli
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
20mm
Lug width20 mm
Case diameter38 mm
Reference03.3400.3610/51.C910
FamilyChronomaster Original
MovementZenith caliber El Primero 3610 hours, minutes, small seconds | date, day, month | Chronograph, column wheel | moonphase
Year2025
CaseStainless Steel
Straps for the Chronomaster Original 03.3400.3610/51.C910
Selected for the 20 mm lug width · workshop selection
Black Rubberized Alligator Strap with Red Tribal Stitching€185
Matte Dark Gray Alligator Strap€195
Millennium Green Alligator Strap — Minimal Stitching€149
Vintage Brown Calfskin Strap — Natural Patina€98
Hammered Calfskin Strap Light Blue€98
The Chronomaster Original 03.3400.3610/51.C910, seen from the bench
The Zenith Chronomaster Original 03.3400.3610/51.C910 is the direct successor to one of modern watchmaking's most influential chronographs. Launched in 1969, the El Primero was the first high-frequency automatic chronograph ever made, beating at 36,000 alternations per hour and measuring tenths of a second with precision previously reserved for manual chronographs. This 38mm stainless steel case model features a triple-calendar complication with date, day, month, and moonphase, powered by the El Primero 3610 caliber with 275 components. The 20mm lug width ensures proper proportions between case and wrist.
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only