The Oris Calibre 400 runs for five days on a full wind, holds within minus three to plus five seconds a day, and comes with a ten-year warranty and a ten-year recommended service interval for watches registered with the brand. That last figure is the one that changes the arithmetic. Most mechanical watches ask for a service every five years or so.
Oris reached that position by staying mechanical when most of the industry went the other way. The brand dropped quartz from its catalogue entirely, and every watch it sells now runs a mechanical movement, either its own or one built on a Sellita base.
What the range actually runs on
The figures below come from a catalogue audit of 61 live Oris listings, discontinued stock excluded, captured in August. All 61 are automatic.
| Calibre family by reference prefix | Live listings |
| 01-733, Sellita SW 200-1 base | 32 |
| 01-400, in-house Calibre 400 | 5 |
| Other calibres and day-date variants | 24 |
Oris encodes the calibre in the reference number, so the first digits after 01 tell you what is inside before you read the specification. A reference starting 01 733 runs the Sellita-based movement. A reference starting 01 400 runs the in-house one.
Five in-house listings against thirty-two Sellita-based ones is the honest shape of the range. The Calibre 400 is the headline, and the 733 is what most buyers actually take home.
What the Calibre 400 does differently
Twin barrels with extended mainsprings each store around two and a half days, which is how the reserve reaches 120 hours at 28,800 vibrations per hour. Lowering the beat rate is the usual route to a long reserve, and this movement does not take it, which is why the accuracy holds.
Over thirty components are non-ferrous. Oris states the movement deviated less than ten seconds a day after exposure to 2,250 gauss, which comfortably exceeds the ISO 764 antimagnetic standard. Magnetisation is the most common reason a mechanical watch suddenly starts running fast, and laptop speakers and magnetic phone mounts make it a daily exposure rather than an occasional one.
The rotor runs on a slide bearing rather than the usual ball bearing, which removes a common wear point from automatic movements.
The ten-year warranty applies to watches registered on the brand’s owner portal, and the ten-year interval excludes accidental damage and water resistance checks, which still need doing on their normal schedule.
Why the 733 is still a sound choice
The Calibre 733 is built on the Sellita SW 200-1, the movement that replaced the ETA 2824-2 across independent Swiss watchmaking. Any watchmaker who has serviced a 2824 can service it, parts cross over, and a full service costs a fraction of what a proprietary calibre does.
Reserve sits around thirty-eight hours, so a watch taken off on Friday evening stops by Sunday. That is the real difference against the Calibre 400, and it matters most to people who rotate between watches.
Creation Watches states the reference number on each listing, which is the fastest way to tell the two apart.
The full range sits in the Oris collection.
How the service interval changes the comparison
A mechanical watch costs its purchase price plus its services. On a five-year interval, a watch kept for twenty years needs three or four services, and that running cost often matters more than the difference between two purchase prices.
A ten-year interval halves that. It does not remove the need for water resistance testing, and it does not make the movement immune to a hard knock, but it changes the long-term cost of ownership more than any specification line on a sheet.
Compare it against the alternatives honestly. A Sellita-based watch is cheaper to buy, cheaper per service and serviceable anywhere. The Calibre 400 costs more to buy and services through the brand network less often.
Other Swiss mechanical ranges sit in the Tissot collection.
Sellita-based alternatives run through the Swiss Alpine Military range.
Who this suits
If you wear one mechanical watch most days and intend to keep it for decades, the Calibre 400 lowers what that costs you over time. If you rotate several watches, or want a movement any watchmaker can open, the 733 is the more practical object and costs less on the way in.
Frequently asked questions
How long is the Oris Calibre 400 power reserve?
Five days, or 120 hours, from a full wind. Twin barrels with extended mainsprings each store around two and a half days of power, and the movement runs at 28,800 vibrations per hour rather than lowering its beat rate to stretch the reserve.
What does the ten-year warranty on the Calibre 400 cover?
Watches registered on the brand’s owner portal carry a ten-year warranty and a recommended ten-year service interval. Accidental damage is excluded, and water resistance checks still need doing on their own schedule regardless of the movement interval. The detail is worth confirming on the specific listing before buying.
How do I tell which Oris movement is in a watch?
Read the reference number. Oris encodes the calibre in it, so a reference starting 01 733 runs the Sellita-based movement and one starting 01 400 runs the in-house Calibre 400. In the audited range, 32 listings carried 733 and five carried 400.
Is the Oris 733 a good movement?
Yes. It is built on the Sellita SW 200-1, the calibre that replaced the ETA 2824-2 across independent Swiss watchmaking. It is reliable, serviceable by any watchmaker familiar with the architecture, and inexpensive to maintain compared with proprietary movements. The detail is worth confirming on the specific listing before buying.
How antimagnetic is the Calibre 400?
Oris states it deviated less than ten seconds a day after exposure to 2,250 gauss, using over thirty non-ferrous components. That comfortably exceeds the ISO 764 antimagnetic standard and matters for anyone working near laptops, speakers and magnetic phone mounts.
Does Oris still make quartz watches?
No. Oris dropped quartz from its catalogue and now sells only mechanical watches. All 61 listings in the audited range carried automatic movements, split between the in-house Calibre 400 and Sellita-based calibres such as the 733. The detail is worth confirming on the specific listing before buying.
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