Zenith Defy Defy El Primero 21 Carl Cox

Reference 10.9001.9004/99.R941

About this watch

The Zenith Defy El Primero 21 Carl Cox is a masterpiece of modern watchmaking, featuring the renowned El Primero 9004 caliber with a cam-actuated chronograph capable of measuring time to 1/100 of a second. This self-winding movement boasts a power reserve for the chronograph of 50 minutes and operates on its own escapement system, with a balance wheel that ticks away at an astounding 360,000 beats per hour. The skeleton design allows you to see the intricate mechanics at work, adding an extra layer of fascination. With its striking design, impressive functionality, and water resistance of up to 100 meters, this watch is perfect for adventurous souls who want to own a piece of horological history.

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Key Features

Carbon case with sapphire glass
El Primero 9004 caliber with chronograph function
Sapphire crystal with anti-reflective coating
Water resistance up to 100 meters
44mm diameter and 23mm lug width

Specifications

Brand

Zenith

Family

Defy

Model

Defy El Primero 21 Carl Cox

Reference

10.9001.9004/99.R941

Movement Features

Hours, Minutes, Small Seconds
Chronograph
Chronometer, Power Reserve Indicator

Case

Carbon 44mm

Dial Color

Skeleton

Crystal

Sapphire

Water Resistance

100

Current Listings

Zenith Defy Skyline Skeleton Black Ceramic

Zenith - Defy Skyline Skeleton · $11,999

For sale is a Zenith Defy Skyline Skeleton Black Ceramic watch, featuring a full ceramic construction with 100M water resistance and an El primero movement beating at 5Hz.

Condition: like new
Water resistance: 100m
Movement type: El primero
Beats per hour: 36000

Posted at

Feb 15, 2026, 1:02 PM

Active

View listing on r/WatchExchange

Zenith Defy El Primero Sunray Blue Extreme Diver FULL SET Ref 95.9601.3620/51.I301

Zenith - 95.9601.3620/51.I301 · $7,850

A modern iteration of the Zenith Defy El Primero diver, featuring a unique blue starry sunray pattern on its dial. The watch is powered by an iconic automatic cal 3620 CS movement and comes in a 42.5MM titanium case.

Condition: Pre-owned, appears mint
Case Size: 42.5mm diameter
Movement Type: automatic cal 3620 CS

Posted at

Feb 15, 2026, 12:20 PM

Active

View listing on r/WatchExchange

2020 Zenith Defy El Primero 21 Skeleton Chronograph – Ref. 49.9000.9004/78.R582 – Full Set – Excellent Condition – $7,750 Shipped

Zenith - 49.9000.9004/78.R582 · $7,750

2020 Zenith Defy El Primero 21 Skeleton Chronograph, a high-performance chronograph showcasing Zenith’s innovative 1/100th-of-a-second movement, featuring an openworked dial and lightweight titanium case.

Condition: Excellent
Case Size: 44mm diameter
Case Material: Titanium
Movement Type: Automatic chronograph (El Primero 21, 1/100th second)

Posted at

Feb 12, 2026, 10:02 PM

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View listing on r/WatchExchange

Zenith Defy Skyline Skeleton 41mm 49.9300.3620/78.1001 BOXES/PAPERS!

Zenith - 49.9300.3620/78.1001

Size: 41mm

Posted at

Feb 11, 2026, 3:06 PM

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Zenith Defy Skeleton Chrono 03.9500.3600/78.I001

Zenith - 03.9500.3600/78.I001

a Zenith Defy Skeleton Chrono is being listed for sale

Model: Defy Skeleton Chrono

Posted at

Feb 9, 2026, 3:03 PM

Active

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Zenith Defy Skyline Skeleton Black Ceramic

Zenith - Defy Skyline Skeleton · $11,999

The Zenith Defy Skyline Skeleton is a high-end watch featuring a full ceramic construction, skeletonized dial, and El primero movement. It has a 100M water resistance and a power reserve of 55 hours.

Condition: like new
Case Material: Black Ceramic
Water Resistance: 100M
Movement Frequency: 5Hz (36,000 vibration per hour)

Posted at

Feb 8, 2026, 3:34 PM

Active

View listing on r/WatchExchange