Zenith El Primero El Primero Chronomaster Full Open 42 Stainless Steel / Alligator

Reference 03.2081.400/78.C813

Zenith El Primero Chronomaster Full Open 42 Stainless Steel / Alligator

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 Port Royal V

Zenith - 01/02.0450.400 · $2,750

The Zenith Port Royal V El Primero features a cool design with symmetry and attention to detail, perfect for most folks due to its 40mm case diameter.

Condition: Excellent, some minor polishing imperfections on the case and bracelet
Case diameter: 40mm
Lug width: 20mm
Lug to lug length: 47mm

Posted at

Mar 9, 2026, 2:29 PM

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Zenith Defy El Primero 21 Titanium Skeleton Box & Papers

Zenith - 95.9000.9004/78.R582 · $70,000

The Zenith Defy El Primero 21 is a bold, technical watch housed in lightweight brushed titanium with an open-worked skeleton dial exposing the in-house El Primero 9004 movement. It has dual escapements, layered subdials, and red chronograph accents creating depth and mechanical drama. The blue rubber strap keeps it sporty and wearable.

Condition: Great pre-owned condition with light signs of wear
Case material: brushed titanium
Movement type: in-house El Primero 9004 movement
Dial description: open-worked skeleton dial

Posted at

Mar 9, 2026, 9:35 AM

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Brand New Zenith Chronomaster Original Reverse Panda El Primero Chronograph | 03.3200.3600/21.C903 | Full Zenith warranty | Lowest Price Online

Zenith - 03.3200.3600/21.C903 · $7,050

A brand new Zenith Chronomaster Original Reverse Panda with a discontinued model reference number and full warranty.

Condition: Brand new, never used
Case size: 44mm diameter
Warranty type: 2-year Zenith warranty

Posted at

Mar 9, 2026, 9:33 AM

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Zenith El Primero Chronomaster Poker Chip 97.G383.400/38.C881 ♦️Like New 2022♦️

Zenith - 97.G383.400/38.C881 · $8,416

This Zenith El Primero Chronomaster Poker Chip is a 2022 model, with a full set of box and papers included.

Condition: Like New
Year Of Production: 2022
Comes With: box & papers

Posted at

Mar 9, 2026, 2:20 AM

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WHOLE LOTTA GOLD! Zenith El Primero Flyback 18K Grand Chronomaster XT Collector Set!

Zenith - 35.1250.4009 · $13,850

The Zenith El Primero Flyback Chronomaster in 18k gold is a large and impressive dress watch with an incredible dial and classic design.

Condition: Mint, with wear throughout due to being 18K gold
Case size: 43MM diameter
Movement type: El Primero automatic chronograph
Dial material: Off-white with silver accents

Posted at

Mar 8, 2026, 9:34 PM

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2024 Zenith Defy Extreme Titanium Diver El Primero Sunray Blue Dial FULL BOXES & CARD SET

Zenith - 95.9601.3620/51.I301 · $7,649

This is a modern iteration of the classic Zenith El Primero Defy diver, featuring a titanium case with a funky sunray blue dial and an iconic automatic calibre 3620 movement.

Condition: Like new, just over a year old
Case diameter: 42.5mm
Movement: El Primero cal 3620 CS
Rotor description: cool rotor visible through the sapphire case back

Posted at

Mar 8, 2026, 9:30 PM

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Zenith 42mm El Primero Chronomaster Open Heart Stainless Steel Complete

Zenith - 03.2040.4061/69.C496 · $4,950

A Zenith El Primero Chronomaster Open Heart chronograph watch, featuring a 42mm stainless steel case and in-house Caliber Zenith El Primero 4061 movement. The watch is dated October 2014 and has been recently serviced by Zenith.

Condition: Mint Condition with light hairline scratches only
Case size: 42mm diameter
Water resistance: 30m depth rating

Posted at

Mar 31, 2025, 1:26 PM

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Zenith El Primero Synopsis Open Heart � BOX & PAPERS � 03.2170.4613/01.M2170

Zenith - 03.2170.4613/01.M2170 · $4,000

A Zenith El Primero Synopsis Open Heart watch with a 40-millimeter case diameter and gold-toned hands, featuring an open heart design and classic modern architecture.

Condition: Excellent, little to no visible wear
Case Diameter: 40mm
Bracelet Length: 16.5 links
Bracket Fit: up to 7.25 inches in circumference

Posted at

Mar 27, 2025, 2:21 PM

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