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Oris Aquis Pro 4000m 49.5mm Mens Watch Blue
Ref. 01 400 7777 7155-SET
Sits in Oris’s upper tier here — more premium than three quarters of the Oris watches we list, which start at £1,400.
Price range £1,400 to £5,350 across 50 Oris watches in stock.The Aquis Pro 4000m is the technical ceiling of Oris's dive range — not a collaboration, not an anniversary piece, simply the answer to the question of how deep a titanium Aquis can go. Unveiled at Geneva Watch Days in 2023, it rates to 400 bar, four times the pressure ceiling of the standard AquisPro, and the case architecture required to achieve that accounts for most of what makes this watch what it is. At 49.5mm across and 23.4mm thick, it reads immediately as something other than a recreational diver. The thickness is the more demanding dimension: reviewers who tested the 4000m against the 1000m sibling found the thinner watch wore considerably better, and the top-heaviness here is real. Titanium keeps the weight from being punishing, and the caseback geometry settles neatly against the wrist, but this is not a watch you wear and then forget. The ceramic bezel insert runs its full scale in lume, and the rubber edge is cut for a positive grip with gloves — details that only make sense if you consider who actually dives at these depths. The Calibre 400 earns its mention. Presented in 2020 as Oris's first fully in-house movement, it carries a silicon escapement, rates better than chronometer standard, and stretches service intervals to a recommended ten years — a genuine shift from the watch industry's usual rhythm. Five days of power reserve means it survives a working week off the wrist without resetting, and the indicator on the dial tells you exactly where it stands.
- Reference
- 01 400 7777 7155-SET
- Brand
- Oris
- Collection
- Aquis
- Case size
- 49.5mm
- Case thickness
- 23.4mm
- Lug width
- 26mm
- Case material
- Titanium
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- 400
- Functions
- Date
- Water resistance
- 4000m
- Bracelet / strap
- Rubber strap
- Strap colour
- Blue
- Clasp
- Folding clasp
- Lume
- Luminous
- Retailer
- Mappin & Webb
Additional specifications
- Lug-to-lug
- 55mm
- Warranty
- 10 years
Learn more about Oris
Paul Cattin and Georges Christian took over an empty factory in Hölstein in 1904 and named the company after a nearby gorge. It stayed independent, and stayed in that valley, for its entire history.
Oris built its reputation on volume mechanical watches made properly. By the 1960s it was among the largest Swiss employers in the sector, producing hundreds of thousands of movements a year. Its most curious historical footnote is regulatory: Swiss law restricted the number of jewels a watch could contain under certain classifications, and Oris fought a decade-long legal battle to be permitted to fit lever escapements — winning in 1968.
The quartz crisis nearly ended it. The company was bought out of the ASUAG conglomerate in 1982 by two managers, Rolf Portmann and Ulrich Herzog, who took it back to mechanical watches exclusively at precisely the moment the rest of the industry was abandoning them.
That independence remains the point. Oris is one of the few Swiss houses of any scale with no group ownership, and it competes on value rather than prestige — dive watches, pilot's watches, and the Big Crown line descended from its 1938 pointer calendar. The house developed its own Calibre 400 family from 2020, offering five-day power reserves and ten-year service intervals at prices well below the norm for in-house movements.
- 1904
- Paul Cattin and Georges Christian found Oris in Hölstein.
- 1938
- The Big Crown pointer calendar is introduced.
- 1968
- Wins the legal fight to use lever escapements.
- 1982
- A management buyout returns the company to independence.
- 2020
- The in-house Calibre 400 launches.
Also in 7 collections
This watch appears in the Oris Aquis range (21), Back in Stock (4,007), Automatic Watches (1,417), Watches 44mm and Over (810), Blue Dial Watches (780), Sports Watches (667) and Dive Watches (486).
Temporarily out of stock
Mappin & Webb is not currently taking orders for this reference. Last listed as available on 25 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 4000m water resistance, rated for actual diving
- 55mm lug-to-lug keeps the 49.5mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- One of Oris's more premium watches
Worth knowing
- 49.5mm is a large watch with real presence
- 23.4mm thick, so it will not disappear under a cuff
Oris Aquis Pro 4000m alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | 01 400 7777 7155-SET | L26784110 |
|---|---|---|
| Price | £5,000 | £5,050 |
| Case size | 49.5mm | 47.5mm |
| Water resistance | 4000m | 30m |
| Movement | Automatic | Automatic |
| Strap | Rubber strap | Leather strap |
| Power reserve | — | 46 hours |
| This watch |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 4000m 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 comparedWhat size strap does it take?
26mm. 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 55mm, which suits wrists from roughly 18.5cm (7¼ 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.
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