Oris: five days of energy and the limits of a house-wide promise

Hölstein, a brook and a useful crown

Oris’s history names Paul Cattin and Georges Christian as its founders in Hölstein in 1904. It dates their contract with the local mayor to 1 June and explains the name through a nearby brook. The same retrospective dates the Big Crown pilot’s watch and its Pointer Calendar to 1938, explaining the larger crown through adjustment while wearing gloves. These are documented manufacturer stories; the original contract and an early watch were not examined for this profile.

The crown story invites a practical way to look at the house: identify the job a feature is intended to make easier. That question can connect an old pilot’s control to a modern movement’s reserve, without treating every later watch as a direct technical descendant of the first model.

Evidence: The history of Oris

Independence and supply answer different questions

The maker dates entry into ASUAG to 1970 and a management buyout led by Rolf Portmann and Ulrich W. Herzog to 1982. Its current history describes Oris as independent, while the website terms identify Oris SA Hölstein as provider. The buyout is a dated business event; these pages do not reveal the complete current shareholding or an exact incorporation history for the present entity.

Its movement disclosure is more specific: selected watches use internally developed Calibre 110+ and 400+ movements, and the range also uses movements from Sellita and ETA. Company independence and component supply can therefore coexist. Internal development describes one part of the work; it does not, by itself, establish that every component was fabricated in the Oris building.

Evidence: The history of Oris, Terms of Use, Which movements does Oris use?

Calibre 400 arranges energy for intermittent wear

Calibre 400 is an automatic movement whose published specification gives 120 hours of reserve and a frequency of 4 Hz. Oris describes two barrels with long mainsprings and a rotor supported by a slide bearing, rather than a ball-bearing arrangement. The technical help article calls the barrels sequential, with torque coming from one mainspring at a time, and states that automatic winding acts as the rotor rotates counterclockwise.

The interesting question is how the design gathers and spends energy over several days. A pair of barrels is an architectural choice, not a certificate of rate consistency. Oris presents the bearing arrangement as a way to reduce friction and wear; the claim remains its engineering account. This profile has neither measured the reserve nor tested the bearing system.

Evidence: Calibre 400, How does the winding system work on a Calibre 400 Series watch?

Read the promises with their conditions

The help centre promises a Calibre 400-series rate of minus three to plus five seconds per day and describes internal testing in five positions before departure from Hölstein. Its comparison with a chronometer standard should not be turned into a statement that every watch has an external chronometer certificate. Wearing patterns, knocks and short-term fluctuations remain part of the maker’s explanation of actual behaviour.

The magnetic-resistance page names more than thirty non-ferrous or anti-magnetic components, including a silicon escape wheel and anchor. It reports exposure to 2250 gauss and a remaining rate deviation below plus or minus ten seconds a day. Those are attributed test claims. The consulted text does not provide the underlying laboratory report, and a residual-rate result after exposure is a different question from use within a continuous magnetic field.

Evidence: I have problems with the accuracy of my Calibre 400 Series watch. What should I do?, How anti-magnetic are Calibre 400 Series movements?

Two Aquis references prevent a blanket specification

The green-dial Aquis Date Calibre 400 reference 01 400 7790 4157-07 4 23 47EB is listed with a 43.5-millimetre case, 120-hour reserve and 30 bar water resistance. The blue-dial Aquis Date reference 01 733 7789 4135-07 8 23 04PEB has the same stated case diameter and water rating, but lists calibre 733-1 and 41 hours of reserve. Both give 4 Hz. The shared collection name is therefore insufficient to choose an endurance figure.

The published warranty extensions also differ: the Calibre 400 reference can reach ten years through MyOris registration, while the 733-1 page offers three. The general supply disclosure names Sellita and ETA, but the consulted reference record does not identify this 733-1’s precise external base. That gap stays open instead of borrowing a movement identification from a retailer or applying an older 733 reserve to the current reference.

Evidence: Aquis Date Calibre 400 —01 400 7790 4157-07 4 23 47EB, Aquis Date —01 733 7789 4135-07 8 23 04PEB, Which movements does Oris use?

A five-day reserve begins with enough winding

Oris’s Calibre 400-series help article says a complete manual wind requires 210 clockwise crown rotations, and explains that automatic winding needs sustained rotor activity. This is unusually useful information for a watch worn in rotation: a brief period on the wrist is not the same starting condition as a fully wound movement. A watch that begins partly wound cannot be expected to demonstrate its full published endurance.

Keep the instruction attached to its series. Counting turns is not a universal ritual for any automatic watch, and unexpected resistance or a fault requires the maker’s advice. For a reading comparison, simply ask whether two reserve observations began from the same winding state. The distinction turns an impressive number into a question the owner can interpret without opening the case.

Evidence: How can I make sure my watch is delivering the full five-day power reserve?

The care pages require a reference-specific conversation

The customer-service page observed in October 2026 recommends 10–12 years for five-day in-house movements, while the help article updated in July 2023 gives ten years for the Calibre 400 series. Water-check language also differs: the customer-service page says five years generally; one help article says annually, another recommends three years for the 400 series, and the service FAQ specifically recommends annual checks for regular diving.

These differences should stay visible. The documents do not establish which wording supersedes the others for a particular reference and use pattern. Ask an authorised service centre to resolve that question for the actual watch, especially before water use or after damage. A long movement-service interval never makes a water-resistance test or an accidental-damage assessment unnecessary.

Evidence: Customer Service, How often does my watch need to be serviced?, How often should I get my watch checked for water resistance?, Do I really only need to service my Calibre 400 Series watch after 10 years?

Agree what a repair may change

The Calibre 400-series repair article describes checking affected components and replacing them at the maker’s discretion. It also says that the entire movement may be replaced when a fault requires more detailed analysis, with regulation and testing before return. Cleaning and case polishing are included in that described procedure. For an owner, those details make a written service brief worthwhile.

Ask what can be repaired, what may be exchanged and whether case refinishing is wanted. Keep the reference, service scope and resulting invoice together. The aim is to understand the provider’s procedure before work begins, rather than to diagnose a fault from a collection name. Continue to Servicing and Restoration for the wider distinction between maintenance, repair and alteration of visible surfaces.

Evidence: What happens to my watch’s Calibre 400 Series movement when I send it back to Hölstein? Will it ever be replaced?, Customer Service

Reader exercise: separate four promises

Create a card for each of the two named Aquis references. Use four rows: reserve, rate promise, water rating and warranty conditions. Put 120 hours and 41 hours in the reserve row, and 30 bar in each water-rating row. Attach the minus-three/plus-five promise only to the consulted Calibre 400-series material; leave the 733-1 rate row unfilled unless its own evidence is obtained. In a separate notes box, record the conflicting service intervals and the question to send to the service centre. The exercise should leave a few explicit unknowns. A complete-looking table with borrowed values would be less useful than an honest one.

Evidence: Aquis Date Calibre 400 —01 400 7790 4157-07 4 23 47EB, Aquis Date —01 733 7789 4135-07 8 23 04PEB, I have problems with the accuracy of my Calibre 400 Series watch. What should I do?, Customer Service, How often does my watch need to be serviced?