Tap the image to enlarge
Zenith Pilot Big Date Flyback 42.5mm Mens Watch
Ref. 49.4000.3652/21.I001
See more premium optionsHide
Stepping up in Zenith's range
Zenith's aviation chronographs trace directly back to the El Primero, the movement that demonstrated a column-wheel flyback could run at 36,000 vibrations per hour without compromise. The 3652 calibre here is a development of that architecture, and the skeletonised rotor — shaped after a cockpit artificial horizon — makes the connection explicit rather than decorative. The flyback function was a practical aviation requirement before it became a complication worth advertising: a single press resets and restarts without the three-step sequence a standard chronograph demands, which matters when timing a second leg immediately after the first. The ceramic case presents as all-black and matte throughout — case, bezel, crown — which keeps the corrugated dial texture doing most of the visual work. Through the exhibition caseback the rotor's instrument-panel form is readable, and the central tenth-of-a-second hand completes a full rotation every ten seconds, making it the most immediate indicator of the movement's pace. The big date jumps in under 0.03 seconds via a patented dual-disc mechanism, and the watch ships with a second khaki rubber strap alongside the black, interchangeable without tools.
- Reference
- 49.4000.3652/21.I001
- Brand
- Zenith
- Case size
- 42.5mm
- Case thickness
- 14.25mm
- Case material
- Ceramic
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Functions
- Chronograph, Date, Small seconds
- Water resistance
- 100m
- Bracelet / strap
- Rubber strap
- Clasp
- Folding clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 60 hours
- Strap
- Interchangeable
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), Sports Watches (667), All Black Watches (292) and Ceramic Watches (93).
Best of 2 retailers
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
- 14.25mm thick, so it will not disappear under a cuff
Zenith Pilot Big Date Flyback alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 49.4000.3652/21.I001 | G0A49022 | 81010-11-3592-1GM |
|---|---|---|---|
| Price | £13,100 | £12,900 | £12,600 |
| Case size | 42.5mm | 42mm | 42mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 60 hours | 50 hours | 54 hours |
| This watch | Closely matched | 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.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Both Mappin & Webb and Goldsmiths list it at £13,100, so choose on delivery and warranty rather than price.
More Zenith watches like the Pilot Big Date Flyback
In stock, and close on style and price
