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.

Buy Now on Jomashop

This is an affiliate link

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

Panerai Luminor Chrono PAM00074 Titanium/Steel Zenith El Primero Movement 2002 (Full-Set/Serviced)

Panerai - PAM 00074 · $6,205

This exceptional Panerai Luminor Chronograph PAM 00074 represents a remarkable fusion of Italian design heritage and Swiss horological excellence. The 40mm titanium case showcases the distinctive Panerai aesthetic with its commanding cushion-shaped profile and signature crown-protecting bridge mechanism.

Condition: Honest wear consistent with careful ownership
Movement: Zenith El Primero automatic movement
Case material: Titanium
Bezel material: Polished steel

Posted at

May 27, 2026, 10:19 AM

Active

View listing on r/WatchExchange

Zenith El Primero Automatic Chronograph “TV Screen” — Ref. 0420.400 — Sharp Case — Neo-Vintage Rarity - Price: $ 2350 Free Shipping

Zenith - 0420.400 · $2,350

A rare and charismatic Zenith El Primero Ref. 0420.400 featuring the iconic rectangular 'TV Screen'-style case design.

Condition: Vintage good condition, lightly worn
Case size: ~36mm x 44mm
Diameter: 40-45mm diameter

Posted at

May 27, 2026, 9:02 AM

Active

View listing on r/WatchExchange

Zenith Defy Skyline Chrono Silver | El Primero 3600 | 1/10th Sec | Full Set 2024 | Bracelet & Strap | $7,950

Zenith - Defy Skyline Chrono · $7,950

Year: 2024

Posted at

May 25, 2026, 4:27 PM

Active

View listing on r/WatchExchange

Brand New 2025 Zenith Chronomaster Original El Primero Chronograph Reverse Panda | 03.3200.3600/21.C903 | Price reduced

Zenith - 03.3200.3600/21.C903 · $6,750

This is a brand new, discontinued Zenith Chronomaster Original Reverse Panda chronograph watch that comes with a full 2-year warranty and the original leather strap.

Condition: Brand new, never used
Material: leather
Strap type: deployant clasp

Posted at

May 25, 2026, 12:38 PM

Active

View listing on r/WatchExchange

Zenith Defy El Primero 21 Blue Dial 95.9002.9004/78.R584 – Box / Papers

Zenith - 95.9002.9004/78.R584 · $6,690

The Zenith Defy El Primero reference 95.9002.9004/78.R584 is a modern Swiss watch blending cutting-edge design with the respected chronograph El Primero movement.

Condition: Excellent condition
Case size: 44mm
Case material: Titanium
Dial condition: Brand new condition

Posted at

May 23, 2026, 11:23 AM

Active

View listing on r/WatchExchange

Zenith Tipo CP-2 Chronograph 03.2240.4069, Underrated El Primero Beast (641/1000)

Zenith - 03.2240.4069 · $4,150

The Zenith Tipo CP-2 Chronograph is a vintage-style chronograph inspired by military designs, featuring a matte black dial and bold lume markers.

Condition: Great condition, showing only light signs of normal wear
Case size: 43mm diameter
Movement: Zenith El Primero Cal. 4069
Power reserve: 50 hour power reserve

Posted at

May 22, 2026, 8:29 PM

Active

View listing on r/WatchExchange

[US] Zenith El Primero Chronomaster Sport - White Dial - 41mm - 03.3100.3600/69.M3100 - Full Set

Zenith - 03.3100.3600/69.M3100 · $7,475

A Zenith El Primero Chronomaster Sport is being sold for a good mechanical timepiece in excellent shape.

Condition: Fantastic condition with few hairlines on clasp, case, and bracelet
Case Size: 41mm diameter

Posted at

May 21, 2026, 6:24 AM

Active

View listing on r/WatchExchange

Zenith | 96.2260.4061/21.R575 | Rolling Stones Edition El Primero | $5,750

Zenith - 96.2260.4061/21.R575 · $5,750

This is a limited edition Zenith El Primero 'Tribute to Rolling Stones' watch in preowned condition, featuring a clean crystal and unknown service history.

Condition: preowned clean condition with minor hairline scratches
Service History: unknown
Shipping: FREE 2 Day Insured FedEx Shipping
Returns: NO RETURNS

Posted at

May 21, 2026, 12:04 AM

Active

View listing on r/WatchExchange