Zenith’s 160th-anniversary DEFY Zero G sapphire watches and the DEFY Skyline Tourbillon are related by the brand’s watchmaking, but they are not the same model. The Zero G editions use a gimbal-mounted mechanism Zenith says keeps the regulating organ horizontal; the Skyline Tourbillon uses a rotating one-minute tourbillon. The Zero G sapphire versions are limited to 10 pieces each, while the steel and black ceramic Skyline Tourbillon specifications describe a separate collection model.
How the Zero G differs from the Skyline Tourbillon
The distinction is mechanical, not just a difference in case design. Zenith’s October 14, 2025 announcement describes the DEFY Zero G’s Gravity Control module as a gimbal-mounted assembly that keeps the regulating organ horizontal. Zenith says the idea was inspired by gimbal-suspended marine chronometers. The company contrasts it with a tourbillon, which rotates the regulating organ to address positional errors in certain static positions. These are Zenith’s explanations of the mechanisms; they are not independent test results establishing that one watch is more accurate in everyday wear. Zenith’s Zero G announcement.
In a Zero G, the module—not the whole movement—is the part Zenith says is held horizontal. The Skyline Tourbillon instead places its regulating assembly in a tourbillon that makes one rotation per minute. The two mechanisms address positional effects differently, so the name “Zero G” should not be read as another name for a tourbillon.
What are the DEFY Zero G 160th-anniversary editions?
Zenith announced two sapphire-cased Zero G versions: one deep celestial blue and one transparent. Each is limited to 10 pieces worldwide, for 20 watches across these two versions. The production limit does not establish how many remain available now. Zenith’s release also cites more than 2,333 chronometry awards in the Maison’s history of observatory competitions; that is a company-wide historical figure, not a Zero G-specific award count.
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Zenith’s Skyline Tourbillon release describes steel and black ceramic versions in a faceted 41 mm case. The specifications below apply to the steel and black ceramic models in that release, not to the later rose-gold skeleton variant.
| Specification | DEFY Skyline Tourbillon (steel or black ceramic) |
|---|---|
| Case | Faceted 41 mm case; steel or black ceramic |
| Movement | Automatic El Primero 3630 |
| Frequency | 5 Hz / 36,000 vibrations per hour |
| Tourbillon rotation | One minute per rotation |
| Power reserve | 60 hours |
| Water resistance | 10 ATM / 100 m |
| Straps and bracelet | Steel or black ceramic bracelet, plus a matching blue or black rubber strap |
Zenith says the supplied rubber strap can be swapped with the bracelet using a case-back quick-change mechanism, without tools. The brand lists its boutiques, online boutiques, and authorized Zenith retailers as sales channels. Zenith’s Skyline Tourbillon release.
What the US price does—and does not—tell you
Zenith’s US Skyline collection page displayed a price of $103,700 for the DEFY Skyline Tourbillon when accessed on October 8, 2026. This is a time-sensitive US listing, not a guaranteed transaction price or a universal price across countries. Taxes, model variant, availability, and retailer terms may differ. Zenith’s US Skyline collection page.
The Zero G announcement establishes edition sizes, not current stock or remaining availability. Check with Zenith or an authorized retailer for current availability and pricing for a specific reference and market.
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Do not confuse it with the Skyline Chronograph 160th Anniversary
The blue ceramic DEFY Skyline Chronograph 160th Anniversary Edition is a separate watch, not a Zero G and not a Skyline Tourbillon. Zenith describes it as a 42 mm chronograph limited to 160 pieces, with an El Primero 3600 movement. Its chronograph seconds hand completes a rotation in 10 seconds, and the release describes a 1/10th-second display. It comes with a blue rubber strap that can be exchanged for its ceramic bracelet using the integrated quick-change setup. Those chronograph details do not apply to the tourbillon. Zenith’s Chronograph anniversary release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.The later Skyline Tourbillon Skeleton is another distinct model
Zenith’s January 19, 2026 release introduced a rose-gold DEFY Skyline Tourbillon Skeleton, reference 18.9300.3630/78.I001, limited to 50 pieces. Its stated movement is the El Primero 3630 SK, with a 5 Hz frequency and 50-hour power reserve; the 41 mm case is rated to 10 ATM. Zenith listed prices of 91,900 CHF, 102,800 EUR, and 103,700 USD in that release. These figures and the 50-hour reserve belong to the rose-gold Skeleton, not the steel and black ceramic Skyline Tourbillon specification above. Zenith’s Skeleton release.
Quick Recap
| Model | What distinguishes it | Edition information |
|---|---|---|
| DEFY Zero G sapphire anniversary editions | Blue or transparent sapphire; gimbal-mounted Gravity Control module, as described by Zenith | 10 pieces per version |
| DEFY Skyline Tourbillon, steel or black ceramic | 41 mm case; El Primero 3630; one-minute tourbillon | The cited release does not state an anniversary limited edition or edition size |
| DEFY Skyline Chronograph 160th Anniversary | 42 mm blue ceramic chronograph; El Primero 3600 | 160 pieces |
| DEFY Skyline Tourbillon Skeleton | Rose gold; El Primero 3630 SK; 50-hour reserve | 50 pieces |
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
