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
![[WTS] 2025 Zenith Defy Skyline Blue Skeleton Dial El Primero 3620 Automatic 41mm Complete Set - 03.9300.3620/79.I001](https://preview.redd.it/h25i9vm0vibf1.jpg?width=640&crop=smart&auto=webp&s=0fd1a54a7379093cf6694c0dfc6368467e324eab)
2025 Zenith Defy Skyline Blue Skeleton Dial El Primero 3620 Automatic 41mm Complete Set - 03.9300.3620/79.I001
This is a Zenith Defy Skyline with a blue skeleton dial, El Primero 3620 automatic movement, and a 41mm stainless steel case.
- Condition: NEW
- Material: Stainless Steel
- Size: 41mm diameter
![[WTS] Zenith Defy Extreme Titanium Chronograph – 1/100th Second El Primero | Full Set (No Card)](https://preview.redd.it/uikocxscwzaf1.jpg?width=640&crop=smart&auto=webp&s=7361b5a80848896fa76ce90a695433fec215272f)

Pre-Owned Zenith DEFY Skyline 03.9300.3620/51.I001
Pre-owned Zenith DEFY Skyline with a 41mm stainless steel case, automatic movement, blue dial, and 100m water resistance. The watch comes with its original inner and outer box, instruction manual, warranty card, hangtag, and a one-year Topper Pre-Owned Select warranty.
- Condition: 90% condition due to slight marks on the lugs, bezel, and throughout the case
- Bracelet size: up to 7 and 3/8 inches
- Warranty duration: one year
- Water resistance: 100 meters
![[WTS] Zenith Defy Skeleton Titanium](https://preview.redd.it/2r2mg0q9niaf1.jpeg?auto=webp&s=a4ed596bead42e7ef442e372f56bcbd2746ee874)
Zenith Defy Skeleton Titanium
A Zenith Defy Skeleton Titanium is being sold, described as one of the coolest watches in the seller's collection. It comes with a full kit and has been serviced.
- Condition: Pre-owned with minor scratch on crystal
- Case material: titanium
- Crystal condition: light scratch

Pre-Owned Zenith DEFY Skyline 03.9300.3620/51.I001
Pre-owned Zenith DEFY Skyline with a blue dial, automatic movement, stainless steel case, and a water resistance of 100 meters. The watch comes with its inner and outer box, instruction manual, warranty card, hangtag, and a one-year Topper Pre-Owned Select warranty.
- Condition: 90% condition due to slight marks on the lugs, bezel, and throughout the case.
- Case size: 41mm diameter
- Bracelet size range: up to 7 and 3/8 inches
- Water resistance: 100m depth rating

Pre-Owned Zenith DEFY Skyline 03.9300.3620/51.I001
Pre-Owned Zenith DEFY Skyline watch in good condition with some minor wear. The watch has an automatic movement and is water-resistant to 100 meters.
- Condition: 90% condition, slight marks on the lugs, bezel, and case; 91% condition on the bracelet
- Case size: 41mm diameter
- Material: Stainless Steel
- Dial color: Blue
![[WTS] Zenith Defy Blue Ceramic 49.9003.670/51.R793](https://preview.redd.it/5v44n2fxd6af1.jpg?width=640&crop=smart&auto=webp&s=16c7500446ad8e23e123b36654d29faa245acb73)
Zenith Defy Blue Ceramic 49.9003.670/51.R793
Discontinued Zenith Defy Classic Blue Ceramic on a rubber strap, featuring a skeletonized dial and elite movement.
- Movement: Elite
- Case material: Blue ceramic
- Strap material: Rubber