Zenith El Primero El Primero Chronomaster Full Open 42 Stainless Steel / Alligator
Reference 03.2081.400/78.C813
About this watch
The Zenith - 03.2081.400/78.C813 El Primero Chronomaster Full Open 42 is a masterpiece that combines centuries of expertise and innovation with precision and craftsmanship. Its stainless steel case, measuring 42.00 mm in diameter and 12.75 mm in height, exudes refined elegance while showcasing the intricate workings of the El Primero movement through an open case back. The skeleton dial is a visual feast for the eyes, featuring stick and dot indexes and modern-style hands that maintain a clean aesthetic. At its core lies the Zenith caliber El Primero 400B movement, renowned for its precision and boasting a frequency of 36,000 vibrations per hour. This automatic movement offers a power reserve of 50 hours, allowing it to run smoothly without frequent winding. The chronograph feature is where this watch truly shines, with a column wheel mechanism providing smooth and reliable timing capabilities. Paired with an alligator leather strap that complements the polished stainless steel perfectly, this timepiece is not only luxurious but also practical, boasting a water resistance of 100 meters.
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Key Features
- Stainless Steel Case
- Sapphire Crystal Glass
- Automatic Movement (Zenith caliber El Primero 400B)
- Chronograph Feature with Column Wheel Mechanism
- Water Resistance: 100 Meters
- Alligator Leather Strap
- 50-Hour Power Reserve
Specifications
- Brand
- Zenith
- Family
- El Primero
- Model
- El Primero Chronomaster Full Open 42 Stainless Steel / Alligator
- Reference
- 03.2081.400/78.C813
- Movement Features
-
- Hours, Minutes, Small Seconds
- Date
- Chronograph, Column wheel
- Case
- Stainless Steel 42mm
- Dial Color
- Skeleton
- Crystal
- Sapphire
- Water Resistance
- 100
Current Listings

Zenith El Primero Ref. 30.0500.400/21
A rare Zenith El Primero Ref. 30.0500.400/21 from the early 2000s, featuring a 38mm 18k yellow gold case and black dial.
- Condition: Pre-owned, with patina on the dial
- Case material: 18k yellow gold
- Diameter: 38mm
- Movement: serviced Zenith caliber El Primero 400