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Zenith Defy El Primero 21 Chronograph 44mm Titanium
Ref. 95.9002.9004/78.M9000
The Defy El Primero 21 belongs to the line Zenith relaunched in 2017 with a specific ambition: to prove that mechanical timekeeping could reach 1/100th of a second without electronics. The calibre 9004 achieves this through a genuinely unusual architecture — two separate escapements sharing one movement, one governing the watch at 36,000 vibrations per hour, the other driving the chronograph at 360,000. The result is a central seconds hand that completes a full sweep every second, making each hundredth visible to the naked eye rather than implied by arithmetic. At 44mm in grade 5 titanium, this wears considerably lighter than its dimensions suggest — 149 grams on the wrist is meaningfully less than an equivalent steel case and bracelet would produce. The blue-anodised main plates read differently depending on angle: as a structural object under direct light, and closer to a dial under diffuse conditions. The skeletonised layout means the 9004's twin-escapement architecture is the dial, and the blue rotor continues the palette through to the caseback. The integrated bracelet is a considered piece of work — the double push-button deployment clasp holds securely without bulk, and titanium's hardness means the bracelet retains its shape over time in a way softer alloys do not.
- Reference
- 95.9002.9004/78.M9000
- Brand
- Zenith
- Collection
- El Primero
- Case size
- 44mm
- Case thickness
- 14.5mm
- Lug width
- 23mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- El Primero 9004
- Functions
- Chronograph, Small seconds, Power reserve indicator, Skeleton dial
- Water resistance
- 100m
- Bracelet / strap
- Titanium bracelet
- Strap colour
- Silver
- Clasp
- Deployant clasp
- Lume
- Luminous
- Condition
- Pre-owned
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 50.4mm
- Power reserve
- 50 hours
- Warranty
- 2 years
Learn more about Zenith
Georges Favre-Jacot founded Zenith in Le Locle in 1865, aged twenty-two, with an idea that was radical for the Swiss industry: bring every trade needed to make a watch — movement, case, dial, hands — under one roof and one management. The integrated manufacture was largely his invention, and the Le Locle site he built is still in use.
The approach produced results at observatory trials, where Zenith accumulated more precision awards than any other manufacture. The name itself came from a calibre Favre-Jacot considered the summit of his work.
Its defining achievement is the El Primero of 1969, developed over seven years and announced in the same year as the Heuer-Breitling consortium's Calibre 11 and Seiko's 6139. It was an integrated automatic chronograph beating at 36,000 vibrations per hour, allowing measurement to a tenth of a second — a frequency almost nothing else matched for decades.
It nearly did not survive. When American owners ordered the mechanical tooling scrapped during the quartz crisis, a watchmaker named Charles Vermot hid the plans, presses, and cams in a walled-off attic. When demand for mechanical chronographs returned, Zenith could restart production because of him. Rolex used the El Primero in the Daytona from 1988 to 2000.
LVMH acquired Zenith in 1999.
- 1865
- Georges Favre-Jacot founds the integrated manufacture at Le Locle.
- 1969
- The El Primero automatic chronograph debuts at 36,000 vph.
- 1975
- Charles Vermot hides the El Primero tooling from destruction.
- 1988
- Rolex adopts the El Primero for the Daytona.
- 1999
- Acquired by LVMH.
Also in 6 collections
This watch appears in Back in Stock (4,405), Automatic Watches (1,634), Chronograph Watches (1,132), Blue Dial Watches (834), Watches 44mm and Over (781) and Pre-Owned, Ex-Display & Vintage Watches (326).
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 50.4mm lug-to-lug keeps the 44mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 44mm sits at the larger end
- 14.5mm thick, so it will not disappear under a cuff
Zenith Defy El Primero 21 alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 95.9002.9004/78.M9000 | 1-37-01-03-02-35 | 81010-11-3153 |
|---|---|---|---|
| Price | £9,650 | £9,750 | £9,450 |
| Case size | 44mm | 42mm | 42mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Titanium bracelet | Leather strap | Stainless steel bracelet |
| Power reserve | 50 hours | 70 hours | 54 hours |
| This watch |
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Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 100m it is rated for swimming and snorkelling, though not for diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 50 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
What size strap does it take?
23mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 50.4mm, which suits wrists from roughly 17.5cm (7 inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Mappin & Webb is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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