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Zenith Chronomaster Solo Sport 40mm Mens Watch Brown
Ref. 03.5001.3620/72.M5000
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Stepping up in Zenith's range
The El Primero calibre has always run at a higher frequency than almost anything else on the market — the architecture behind it dates to 1969 and was built for chronograph precision. The 3620 is what that engine becomes when stripped back to time-only: the silicon escapement and 36,000 vph remain, the star-shaped openwork rotor remains, and the 60-hour reserve gains room to breathe without the chronograph mechanism above it. The Solo Sport is where that movement meets a build rated to 200 metres, with integrated crown guards and a unidirectional ceramic bezel in matching brown. The brown ceramic dial is not merely coloured — it carries an engraved repeating "Z" motif at 45 degrees, so the surface shifts under changing light, and a peripheral shark-tooth minute track that references vintage Zenith chronographs. At 40mm with a 46mm lug-to-lug span, it sits closer to the wrist than its rated depth suggests and wears more compactly than the case material and bezel would lead you to expect. The ZENCLASP bracelet clasp adjusts without tools, which matters on a watch likely to move between a wetsuit cuff and a shirtsleeve.
- Reference
- 03.5001.3620/72.M5000
- Brand
- Zenith
- Collection
- Chronomaster
- Case size
- 40mm
- Case thickness
- 13.3mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Brown
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- El Primero 3620
- Functions
- Chronograph, Date, Skeleton dial
- Water resistance
- 200m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 46mm
- Power reserve
- 60 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 7 collections
This watch appears in the Zenith Chronomaster range (23), Back in Stock (4,868), Stainless Steel Watches (3,133), Automatic Watches (1,750), Chronograph Watches (1,199), Sports Watches (800) and Dive Watches (572).
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What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- 40mm suits most wrists
- 46mm lug-to-lug keeps the 40mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Also seen with this model (1)
Other versions of this model, not necessarily this exact watch.
- Aaron Rodgers · Zenith Chronomaster · Ambassador · Chronomaster Sport · Source
Zenith Chronomaster Solo Sport alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 03.5001.3620/72.M5000 | 1-39-11-06-80-06 | H9762 |
|---|---|---|---|
| Price | £9,700 | £8,200 | £8,450 |
| Case size | 40mm | 39.5mm | 38mm |
| Water resistance | 200m | 200m | 200m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Rubber strap | Ceramic bracelet |
| Power reserve | 60 hours | — | 70 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 200m it is rated for swimming, snorkelling and recreational 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 60 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Will it fit my wrist?
Lug-to-lug is 46mm, which suits wrists from roughly 16cm (6¼ 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, though at 40mm it sits in the range that suits anyone.
Cheapest place to buy
Both Mappin & Webb and Goldsmiths list it at £9,700, so choose on delivery and warranty rather than price.
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