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Zenith Chronomaster Sport 41mm
Ref. 18.3100.3600/69.C920
Sits in Zenith’s upper tier here — more premium than three quarters of the Zenith watches we list, which start at £7,200.
Price range £7,200 to £28,000 across 27 Zenith watches in stock.The El Primero was among the first automatic chronograph movements ever made, launched in 1969, and Zenith has never really stopped developing it. The Calibre 3600 is the current high point of that line: it beats at 5Hz, which is fast enough to time to a tenth of a second, and the ceramic escape wheel and anchor run without lubrication, which is not a small thing in a movement asked to run for 60 hours between winds. The bezel scale is graduated to reflect that tenth-of-a-second capability directly — the chronograph hand completes a full rotation every ten seconds, so the markings are genuinely readable rather than decorative. Rose gold and a black ceramic bezel is a combination that could easily read as costume, but the tri-colour registers — the three subdials sitting in subtly different metallic tones against the white dial — pull it back toward something older and more purposeful, a visual language Zenith has used long enough that it reads as heritage rather than styling. At 41mm with a lug-to-lug of 46.8mm it will settle onto most wrists without overhang, and the triple-folding deployant in matching rose gold distributes the case weight across the strap rather than loading it onto the buckle point.
- Reference
- 18.3100.3600/69.C920
- Brand
- Zenith
- Collection
- Chronomaster
- Case size
- 41mm
- Case thickness
- 13.6mm
- Lug width
- 20mm
- Case material
- Rose gold
- Case shape
- Round
- Dial
- White
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- El Primero 3600
- Functions
- Chronograph, Date, Small seconds, Tachymeter
- Water resistance
- 100m
- Bracelet / strap
- Leather strap
- Strap colour
- Black
- Clasp
- Deployant clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 46.8mm
- 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 6 collections
This watch appears in the Zenith Chronomaster range (19), Automatic Watches (1,403), Chronograph Watches (1,162), Leather Strap Watches (928), Sports Watches (643) and Solid Gold Watches (118).
Temporarily out of stock
Goldsmiths is not currently taking orders for this reference. Last listed as available on 26 August 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
- 46.8mm lug-to-lug keeps the 41mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- One of Zenith's more premium watches
Worth knowing
- Leather does not suit regular contact with water
Zenith Chronomaster Sport alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 18.3100.3600/69.C920 | pfc930-1020001-400182 | 1LTAT.U01A.N001U |
|---|---|---|---|
| Price | £21,800 | £19,900 | £21,400 |
| Case size | 41mm | 41mm | 42.5mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Rubber strap | Titanium bracelet |
| Power reserve | 60 hours | 60 hours | 60 hours |
| This watch | Closely matched |
|
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 60 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
What size strap does it take?
20mm. 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 46.8mm, which suits wrists from roughly 16cm (6¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
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