Zenith El Primero Chronomaster Open Stainless Steel / Silver / Bracelet

Reference 03.3300.3604/69.M3300

About this watch

When it comes to luxury watches, few brands command respect like Zenith. Renowned for its precision and craftsmanship, Zenith has introduced the Chronomaster Open Stainless Steel / Silver / Bracelet (Model: 03.3300.3604/69.M3300). This stunning timepiece is not just a watch; it's a statement. Let’s dive into the intricacies of this remarkable watch and see what makes it a standout in the world of horology. The Zenith Chronomaster Open boasts a beautifully crafted stainless steel case with a diameter of 39.50 mm, striking a perfect balance between presence and wearability. The sunburst finish gives it a striking appearance, reflecting light in a way that catches the eye without being overly flashy. The stainless steel bracelet enhances the watch's elegance while ensuring durability. It feels solid on the wrist, yet comfortable enough for daily wear. The design is both modern and classic, making it versatile enough to pair with various outfits. The dial of this watch is where the magic truly happens. The open heart design allows you to glimpse the inner workings of the watch, showcasing the exquisite craftsmanship of the El Primero movement. The silver color provides a clean and sophisticated look, while the stick and dot indexes add a touch of modernity. The hands are also designed with precision in mind; they’re stick-shaped, ensuring readability while maintaining an elegant aesthetic. The central chronograph hand is particularly noteworthy, making one full turn every 10 seconds, which is a unique feature that adds to the watch's sporty character. What sets the Chronomaster Open apart is its movement. The El Primero 3604 is a modified version of the 3600 that debuted in the CHRONOMASTER Sport. It’s an automatic chronograph that can measure and display time down to the 1/10th of a second. With a frequency of 36,000 vibrations per hour, the 3604 offers a level of precision that is hard to match. The movement features a stop-second mechanism, allowing you to set the time accurately, which is essential for a watch of this caliber. The El Primero 3604 boasts an impressive power reserve of 60 hours. This means you can take it off for a weekend and still find it ticking away when you put it back on. The automatic winding mechanism is efficient, utilizing a lubricant-free silicon escape wheel and pallet lever, which minimizes maintenance and enhances durability. With a water resistance of 100 meters, the Zenith Chronomaster Open is not just a pretty face. It’s built to withstand splashes and even brief swims. Whether you’re caught in a rain shower or enjoying a day at the beach, you can trust this watch to keep ticking without missing a beat.
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Key Features

  • Automatic chronograph movement (El Primero 3604)
  • Stainless steel case with sunburst finish
  • Sapphire crystal glass
  • 100m water resistance
  • 60-hour power reserve
  • Stop-second mechanism for accurate time-setting
  • High-frequency movement with 1/10th of a second chronograph

Specifications

Brand
Zenith
Family
El Primero
Model
Chronomaster Open Stainless Steel / Silver / Bracelet
Reference
03.3300.3604/69.M3300
Movement Features
  • Hours, Minutes, Small Seconds
  • Chronograph, Column wheel
Case
Stainless Steel 39.5mm
Dial Color
Silver
Crystal
Sapphire
Water Resistance
100

Current Listings

[WTS] Ultra Rare Zenith El Primero Tourbillon Chronograph in 18K White Gold - Collector Set - JUST 50 MADE!

Ultra Rare Zenith El Primero Tourbillon Chronograph in 18K White Gold - Collector Set - JUST 50 MADE!

The Zenith El Primero Tourbillon Chronograph is a legendary watch featuring a tourbillon and chronograph functions in a limited edition of just 50 pieces. It comes in a beautiful collector set including an appraisal from Zenith showing a value of six figures.

  • Condition: Really clean condition, including the sapphire crystal.
  • Movement Type: El Primero automatic chronograph cal 4005
  • Case Material: 45MM 18K solid white gold
  • Case Dimensions: 45mm diameter
Posted at
Apr 12, 2026, 9:52 PM
Active
[WTS] Zenith El Primero Chronomaster Sport Titanium Full Box & Cards Set Ref 95.3100.3600/39.M3100

Zenith El Primero Chronomaster Sport Titanium Full Box & Cards Set Ref 95.3100.3600/39.M3100

This is a 2-year-old Zenith El Primero Chronomaster Sport Titanium watch with a gray dial and tri-colored chrono sub-dials. It features a 41mm full titanium case and an iconic chronograph movement.

  • Condition: like new, with some light wear on the titanium bezel and case sides
  • Case size: 41mm diameter
  • Movement type: automatic
  • Depth rating: 30m water resistance
Posted at
Apr 12, 2026, 8:32 PM
Active
[WTS] Zenith Defy El Primero 21 $5150 Priced to move

Zenith Defy El Primero 21 $5150 Priced to move

A high-end sports watch designed for everyday wear, featuring a complex automatic movement and a modern design.

  • Condition: Moderate wear, light scratches on the case/bezel/claps
  • Serial number: unknown
  • Box and cards included: no
  • Shipping method: insured and tracked
Posted at
Apr 12, 2026, 7:59 PM
Active
[WTS] Zenith Defy El Primero 21 $5300 95.9002.9004/78.R584

Zenith Defy El Primero 21 $5300 95.9002.9004/78.R584

The Zenith Defy El Primero 21 is a high-end watch with a unique design and impressive features.

  • Condition: Moderate wear, fully functional
  • Serial number: 78.R584
Posted at
Apr 11, 2026, 9:32 PM
Active
[WTS] Zenith El Primero ref. 01.0200.415 Big Blue 7000 run like hell circa 1973

Zenith El Primero ref. 01.0200.415 Big Blue 7000 run like hell circa 1973

A Zenith El Primero Big Blue from the 1970s, featuring a high-frequency automatic chronograph movement and an oversized TV-shaped case with a vibrant blue dial.

  • Condition: Excellent for its age
  • Case size: 42mm
  • Lug to lug distance: 44h
  • Crystal size: 14.3 cc
Posted at
Apr 8, 2026, 4:48 PM
Active
[WTS] Zenith “Open Heart” - El Primero Movement - CHEAP

Zenith “Open Heart” - El Primero Movement - CHEAP

Zenith - 03.0520.4021 · $2,750
This Zenith El Primero ‘Open Heart’ features a rare white dial and showcases the iconic high-beat chronograph movement with an open-heart design.

  • Condition: Very Good
  • Case size: ~42 mm diameter
  • Movement type: El Primero high-beat automatic chronograph (36,000 vph)
  • Dial color: white
Posted at
Apr 7, 2026, 12:10 PM
Active
[WTS][US] Zenith El Primero Chronomaster Sport - White Dial - 41mm - 03.3100.3600/69.M3100 - Full Set

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

The Zenith El Primero Chronomaster Sport features a white dial and is sized at 41mm.

  • Condition: Fantastic with full protective sticker kit installed
  • Case size: 41mm
  • Functions: mechanically perfect
Posted at
Apr 7, 2026, 8:13 AM
Active
Zenith 42mm El Primero Chronomaster Open Heart Stainless Steel Complete

Zenith 42mm El Primero Chronomaster Open Heart Stainless Steel Complete

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

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

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
Active