The oris aquis date calibre 400 brings together the rugged design of a professional dive watch with the convenience of a modern automatic movement. Oris designed the Aquis collection for people who want a watch that can handle water, travel, work, and everyday wear without losing its refined appearance.

At the heart of this model is the Calibre 400, Oris's automatic mechanical movement. It offers a five-day, or 120-hour, power reserve, strong resistance to magnetic fields, and a recommended 10-year service interval.

The result is a watch that feels practical rather than overly complicated. Its combination of a sporty case, clean dial, date display, and long-running movement makes it suitable for both casual and more polished outfits.

What Makes the Oris Aquis Date Calibre 400 Different?

The Aquis has been one of Oris's most recognizable collections for years. With the introduction of Calibre 400, the brand gave the familiar dive-watch design a movement developed around long-term everyday use.

The oris aquis date calibre 400 is available in different sizes and configurations, but the 43.5 mm version remains one of the key models. Oris lists stainless steel construction, a ceramic minute-scale top ring, sapphire crystal, a screw-down crown, and 300-metre water resistance on its current 43.5 mm model.

A Strong Dive-Watch Foundation

The Aquis design is easy to recognize. Its rotating bezel provides a traditional diving function, while the strong case and water resistance give the watch a purposeful character.

The 300-metre water-resistance rating also gives owners plenty of flexibility for swimming and water-based activities. As with any mechanical dive watch, however, regular water-resistance checks are sensible, especially when the watch is frequently exposed to water.

The Calibre 400 Movement

The biggest reason to look closely at the oris aquis date calibre 400 is the movement inside it. Instead of using a standard third-party automatic calibre, Oris developed the Calibre 400 as its own mechanical movement.

It uses two mainspring barrels to deliver 120 hours of power reserve. That means you can remove the watch for several days and still find it running when you put it back on.

Five Days of Power Reserve

A five-day power reserve is especially useful for people who own more than one watch. You can wear another watch during the week and return to the Aquis later without immediately needing to reset the time and date.

The movement operates at 28,800 vibrations per hour, or 4 Hz. Oris also states an accuracy target of -3/+5 seconds per day for its Calibre 400 series.

Designed for Magnetic Resistance

Modern life exposes mechanical watches to many sources of magnetic fields, including electronics and other everyday equipment. The Calibre 400 addresses this with a design that uses specialized components to improve resistance to magnetism.

Oris states that the movement offers elevated anti-magnetism, while independent watch coverage has reported testing to levels of up to 2,250 gauss.

This does not make the watch immune to every possible magnetic effect, but it adds another layer of protection for everyday use.

Design and Wearability

The oris aquis date calibre 400 keeps the bold personality that defines the Aquis family. The stainless steel case has a strong sports-watch appearance, while polished and brushed surfaces help create a more refined look.

The sapphire crystal is another important feature. Sapphire is highly resistant to scratches compared with conventional mineral glass, making it well suited to a watch designed for regular use.

Dial and Date Display

The dial is designed around clear reading rather than unnecessary decoration. Large hands and hour markers help with visibility, while luminous details make the watch easier to read in darker conditions.

A date window adds everyday practicality. Depending on the particular reference, Oris offers different dial colors and bracelet or strap combinations, giving buyers some room to match the watch with their personal style.

Bracelet and Strap Options

The Aquis can be paired with a stainless steel bracelet or rubber strap depending on the reference. Oris also offers quick-change solutions on certain versions, making it easier to change the watch's appearance without completely changing its character.

A steel bracelet gives the watch a more traditional luxury-sports feel. A rubber strap, on the other hand, creates a more relaxed and water-focused appearance.

Why the 10-Year Warranty Matters

One of the more interesting parts of the oris aquis date calibre 400 package is Oris's approach to long-term ownership.

Oris says watches powered by the Calibre 400 series can receive a 10-year warranty after registration with MyOris, along with a recommended 10-year service interval.

Built Around Long-Term Ownership

Mechanical watches require care, and servicing can become an important part of ownership. A longer recommended service interval can make the ownership experience simpler, although water resistance should still be monitored when a dive watch is regularly used around water.

This approach also shows that Oris designed Calibre 400 around more than just power reserve. The movement combines longevity, accuracy, anti-magnetic protection, and everyday practicality in one package.

Is the Oris Aquis Date Calibre 400 Versatile?

The oris aquis date calibre 400 has the appearance of a serious dive watch, but its styling allows it to move beyond the beach or swimming pool.

With a shirt and trousers, it can add a sporty touch without looking out of place. With jeans and a T-shirt, its tool-watch character feels natural. That flexibility makes it appealing to people who want one mechanical watch for several parts of their lifestyle.

A Watch for Different Occasions

The watch can work for travel, weekends, outdoor activities, office environments, and casual evenings. Its larger case gives it a strong wrist presence, while the clean dial keeps the overall design controlled.

The 41.5 mm versions may also appeal to people who prefer a slightly more compact Aquis. Oris currently offers Calibre 400 models in both 41.5 mm and 43.5 mm configurations.

Final Thoughts on the Oris Aquis Date Calibre 400

The oris aquis date calibre 400 represents a useful combination of traditional Swiss mechanical watchmaking and modern ownership needs. Its Aquis case provides the familiar dive-watch foundation, while Calibre 400 adds a 120-hour power reserve, enhanced anti-magnetic performance, and a long service interval.

Rather than focusing only on appearance, Oris has put considerable attention into the movement and the experience of owning the watch over many years. For anyone exploring mechanical dive watches, the Aquis Date Calibre 400 offers an interesting balance between sporty design, technical features, and everyday versatility.

Its bold proportions, practical date display, sapphire crystal, 300-metre water resistance, and five-day power reserve give it a clear identity. Whether worn with casual clothing or a more refined outfit, it remains recognizably an Aquis while bringing the added technology of Oris's Calibre 400 movement.