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][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

Up for sale is a Zenith El Primero Chronomaster Sport - White Dial - 41mm - Full Set Watch functions perfectly mechanically, without issue.

  • Condition: Fantastic condition with few hairlines
  • Case Size: 41mm
Posted at
Apr 24, 2026, 8:41 AM
Active
[WTS] Brand New Zenith Chronomaster Original El Primero Chronograph Reverse Panda | 03.3200.3600/21.C903 | Still under Zenith warranty

Brand New Zenith Chronomaster Original El Primero Chronograph Reverse Panda | 03.3200.3600/21.C903 | Still under Zenith warranty

This Zenith Chronomaster Original Reverse Panda is a brand new, discontinued model still under warranty and comes on the original leather strap.

  • Condition: Brand new, never used
  • Warranty type: 2-year with optional 3-year extension
  • Strap material: leather
  • Box type: LVMH
Posted at
Apr 22, 2026, 12:01 PM
Active
[WTS] Zenith Defy Skyline Chrono Silver - El Primero - Full Set 2024 - Integrated Bracelet & Green Strap w/ Deployant - $8,050

Zenith Defy Skyline Chrono Silver - El Primero - Full Set 2024 - Integrated Bracelet & Green Strap w/ Deployant - $8,050

This is a Zenith Defy Skyline Chrono Silver with an El Primero movement, featuring a silver 'Starry Sky' dial and integrated stainless steel bracelet.

  • Condition: Excellent
  • Movement: El Primero 3600, automatic chronograph
  • Frequency: 36,000 vph (5Hz)
  • Power Reserve: 60 hours
Posted at
Apr 21, 2026, 3:45 PM
Active
[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 limited edition of just 50 made in full 18 karat white gold, featuring a tourbillon and automatic chronograph cal 4005.

  • Condition: Really clean condition, with minimal wear on the case
  • Movement: El Primero automatic chronograph cal 4005
  • Case Size: 45MM diameter
  • Case Material: 18K solid white gold
Posted at
Apr 19, 2026, 10:25 PM
Active
[WTS] Zenith El Primero Titanium Chronomaster Sport FULL SET Ref 95.3100.3600/39.M3100

Zenith El Primero Titanium Chronomaster Sport FULL SET Ref 95.3100.3600/39.M3100

The Zenith El Primero Chronomaster Sport is a titanium version of the iconic chronograph movement in a modern automatic calibre 3600. It features a gray dial, tri-colored chrono sub-dials, and a sapphire case allowing for viewing of the rotor.

  • Condition: Excellent, some light wear on titanium bezel and case sides
  • Movement: El Primero cal 3600 automatic
  • Case size: 41mm diameter
  • Bracelet length: 7.25 inches, adjustable with two additional links
Posted at
Apr 19, 2026, 8:42 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

Up for sale is a Zenith El Primero Chronomaster Sport with a white dial and 41mm case, featuring a perfectly working mechanical movement.

  • Condition: Fantastic condition with few hairlines on clasp, case, and bracelet
  • Diameter: 41mm
  • Case Condition: few hairlines on clasp, case, and bracelet
Posted at
Apr 17, 2026, 6:30 AM
Active
[WTS] Zenith “Open Heart” - El Primero Movement - Price Reduced

Zenith “Open Heart” - El Primero Movement - Price Reduced

Zenith - 03.0520.4021 · $2,550
A Zenith El Primero automatic chronograph with an open-heart design and a rare white dial variant.

  • Condition: Very Good
  • Movement Type: El Primero high-beat automatic chronograph (36,000 vph)
  • Case Size: ~42 mm diameter
  • Crystal Type: Sapphire crystal
Posted at
Apr 16, 2026, 8:32 PM
Active
[WTS] 1970 Zenith El Primero A385 Chronograph - $7,250

1970 Zenith El Primero A385 Chronograph - $7,250

Zenith - A385 · $7,250
This Zenith El Primero A385 is a limited edition chronograph from the late 1960s and early 1970s, featuring an automatic movement that was historically significant for its time. It has been well maintained and is in excellent condition with minimal signs of wear.

  • Condition: Excellent
  • Movement caliber: 3019 PHC/400
  • Case dimensions: [object Object]
  • Power reserve: 50 hours
Posted at
Apr 16, 2026, 8:05 PM
Active
[WTS] Zenith El Primero Chronomaster Revival Shadow 97.T384.4061/21.C822 ( excellent / 2022 / box and papers )

Zenith El Primero Chronomaster Revival Shadow 97.T384.4061/21.C822 ( excellent / 2022 / box and papers )

Up for sale is an excellent condition Zenith El Primero Chronomaster Revival Shadow, complete with all boxes, papers, and booklets.

  • Condition: Excellent
  • Case material: Titanium
  • Case size: 37mm
  • Movement: El Primero
Posted at
Apr 16, 2026, 12:24 PM
Active