Since its debut two years ago, the Defy Skyline collection has become one of Zenith’s best-sellers. Now, Zenith adds a tourbillon to the collection to create two 41mm Defy Skyline Tourbillon models, one in steel and the other in black ceramic.
Zenith’s own high-frequency movement houses an open-worked tourbillon with a cage shaped to mimic the Zenith star logo. The new debuts maintain the signature sunray pattern metallic dial found throughout the Defy Skyline series. Zenith places the tourbillon within an aperture on the lower portion of the dial. 
The tourbillon design is notably open with a prominent mirror-polished bridge. On the black ceramic model, the bridge’s gold-plated hue matches the dial’s markers and hands.
On the steel edition, the markers and hands are rhodium plated to match the case finish.
Each dial features a pattern of engraved four-pointed stars that appear to radiate away from the tourbillon, expanding as they reach the dial’s edge.
As noted, Zenith’s new El Primero 3630 automatic high-frequency caliber powers both models, offering generous power reserve of sixty hours. The movement’s open star-shaped rotor offers the owner a nice view of the very modern movement. 
Zenith fits the Defy Skyline Tourbillon on either a stainless steel or black ceramic bracelet, depending on the model, and adds a second strap in blue or black rubber. The strap can be quickly changed by the owner using the caseback’s quick strap-change mechanism.
Prices: $57,100 (steel) and $67,400 (black ceramic)
Specifications: Zenith Defy Skyline Tourbillon
Steel:
Reference: 03.9300.3630/51.I001
Key points: Automatic high frequency tourbillon. Starry sky pattern on the dial that starts from tourbillon. Screwed-in crown. Full interchangeable strap system.
Movement: El Primero 3630 automatic.
Frequency: 36,000 VpH – 5Hz
Power reserve: approx. 60 hours
Functions: Hours and minutes in the center tourbillon: The carriage is positioned at 6 o’clock; it makes one turn per minute; tourbillon cage with 56 components.
Finishes: Special oscillating weight with satined finishings
Material: Stainless steel
Water resistance: 10 ATM
Case: 41mm
Dial: Blue-toned sunray-patterned
Hour markers: Rhodium-plated, faceted and coated with SuperLuminova SLN C1
Hands: Rhodium-plated, faceted and coated with SuperLuminova SLN C1
Bracelet & Buckle: Stainless steel bracelet with folding clasp. 2nd strap included: blue rubber with folding clasp.
Price: $57,100.
Black Ceramic:
Reference: 49.9300.3630/21.I001
Key points: Automatic high-frequency tourbillon. Starry sky pattern on the dial that starts from tourbillon. Screwed-in crown. Full interchangeable strap system.
Movement: El Primero 3630 automatic
Frequency: 36,000 VpH – 5Hz
Power reserve: approx. 60 hours
Functions: Hours and minutes in the center tourbillon: The carriage is positioned at 6 o’clock; it makes one turn per minute; tourbillon cage with 56 components.
Finishes: Special oscillating weight with satined finishings
Material: Black ceramic
Water resistance: 10 ATM
Case: 41mm
Dial: Black-toned sunray pattern.
Hour markers: Gold-plated, faceted and coated with SuperLuminova SLN C1
Hands: Gold-plated, faceted and coated with SuperLuminova SLN C1
Bracelet & Buckle: Black ceramic bracelet with folding clasp. 2nd strap included: black rubber with steel black PVD folding clasp.
Price: $67,400
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