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Zenith Defy El Primero
Ref. 95.9000.9004/78.R582
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The El Primero name has belonged to Zenith since 1969, when they produced one of the first automatic chronograph movements. The calibre 9004 is what that lineage eventually built toward: a double-escapement architecture in which two independent gear trains run simultaneously, one governing the time at 5 Hz, a second beating at 50 Hz to drive the chronograph alone. That second frequency is what makes 1/100th-of-a-second measurement possible in a mechanical watch — the large central chronograph hand completes a full rotation every ten seconds, so a single step is a hundredth. The skeletonised dial is functional here rather than decorative. With the movement exposed through the casework, you can watch both escapements at work side by side, which is a different experience from looking at a conventional skeleton. At 44mm in titanium the watch sits large on the wrist but carries far less mass than steel at that diameter, and the alligator-over-rubber strap — built for sport use — keeps the case stable during the kind of timing for which the movement was designed. The linear power reserve indicator at twelve tells you at a glance how much is left in the chronograph module specifically, which matters because the two mechanisms wind independently.
- Reference
- 95.9000.9004/78.R582
- Brand
- Zenith
- Collection
- El Primero
- Case size
- 44mm
- Case thickness
- 14.50mm
- Lug width
- 23mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Bidirectional rotating
- Movement
- Automatic
- Calibre
- 9004
- Functions
- Chronograph, Power reserve indicator, Skeleton dial
- Water resistance
- 100m
- Bracelet / strap
- Leather strap
- Strap colour
- Black
- Clasp
- Deployant clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 50 hours
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 (4,007), Automatic Watches (1,417), Chronograph Watches (1,131), Leather Strap Watches (904), Watches 44mm and Over (810) and Skeleton Watches (260).
Temporarily out of stock
Mappin & Webb is not currently taking orders for this reference. Last listed as available on 26 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 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
- Leather does not suit regular contact with water
Zenith Defy El Primero alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 95.9000.9004/78.R582 | 1533-320LE-3A-175/1B | G0A43001 |
|---|---|---|---|
| Price | £11,500 | £11,380 | £11,400 |
| Case size | 44mm | 44mm | 42mm |
| Water resistance | 100m | 50m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Leather strap | Leather strap |
| Power reserve | 50 hours | — | 50 hours |
| This watch |
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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.
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