TL;DR: The Oris Aquis Date with Calibre 400 is one of the best Swiss dive watches you can buy under $4,000. You get a 5-day power reserve, antimagnetic in-house movement, 300m water resistance, and a ceramic bezel — all from a brand with genuine horological credentials. The standard Calibre 733 version starts around $2,100, making it an even sharper value. If you want serious Swiss dive-watch quality without the Rolex or Omega premium, the Aquis deserves a spot on your shortlist.
Table of Contents
- Quick Verdict
- Why the Oris Aquis Matters in 2026
- Full Specifications
- Design & Build Quality
- Movement: Calibre 400 vs Calibre 733
- On the Wrist
- Value & Pricing
- How It Compares
- Who Should Buy This Watch
- Frequently Asked Questions
- Recent Articles
Quick Verdict
The Oris Aquis Date is the watch that finally made “affordable Swiss diver” feel like a genuine luxury product rather than a compromise. With the Calibre 400, Oris delivered an in-house movement that rivals movements costing two to three times more — 120 hours of power reserve, antimagnetic protection, and a 10-year warranty. The result is a dive watch that punches so far above its weight that it’s embarrassing for some of its more expensive competitors.
If you’re cross-shopping the Omega Seamaster 300M or a Tudor Black Bay 58, the Aquis Calibre 400 deserves serious consideration — especially if value-for-money matters to you.
Why the Oris Aquis Matters in 2026
Oris has been making watches since 1904 in Hölstein, Switzerland, but for decades the brand lived in the shadow of the Swatch Group giants. That changed dramatically when Oris launched the Calibre 400 in 2020 — their first fully in-house automatic movement in over 35 years. Suddenly, a brand known for offering solid modified-Sellita movements at fair prices was competing on technical merit with the likes of Omega and Tudor.
The Aquis collection is Oris’s flagship dive watch line, and it’s where the Calibre 400 shines brightest. Available in four case sizes (36.5mm, 39.5mm, 41.5mm, and 43.5mm), the Aquis covers virtually every wrist size. The 41.5mm version has become the sweet spot for most buyers — large enough to have genuine wrist presence without overwhelming smaller wrists.
In the watch community, particularly on Reddit’s r/Watches, the Aquis has earned a reputation as the “smart money” dive watch. It’s consistently recommended as the best Swiss diver you can buy before stepping up to Omega or Rolex territory.
Full Specifications
| Specification | Oris Aquis Date Cal. 400 |
|---|---|
| Reference | 01 400 7769 4135 |
| Case Diameter | 41.5mm |
| Case Thickness | 13.4mm |
| Lug-to-Lug | 47.5mm |
| Case Material | Stainless Steel (316L) |
| Bezel | Unidirectional, Ceramic Insert |
| Crystal | Double-Domed Sapphire, Anti-Reflective |
| Movement | Oris Calibre 400 (In-House Automatic) |
| Power Reserve | 120 Hours (5 Days) |
| Accuracy | ±3 sec/day (COSC-grade) |
| Water Resistance | 300m / 30 bar |
| Strap/Bracelet | Steel Bracelet or Rubber Strap |
| Warranty | 10 Years |
| Price (MSRP) | $3,300–$3,800 |
Design & Build Quality
The Aquis has a distinctive look that sets it apart from the usual dive-watch formula. The case features gently curved lugs that flow into either the integrated steel bracelet or the molded rubber strap. There’s a subtle ridge running along the case side that gives it architectural interest without being gimmicky.
The ceramic bezel insert is excellent at this price. It has a satisfying 120-click action with no back-play, and the lumed pip at 12 o’clock is well-applied. The bezel grip is achieved through fine knurling on the edge rather than coin-edge or scalloped designs — a detail that works well when wet.
Dial finishing is where Oris really delivers. The sunburst blue version, in particular, catches light beautifully and shifts between deep navy and bright electric blue depending on the angle. Applied hour markers sit in recessed wells and are generously filled with Super-LumiNova, providing excellent legibility in darkness.
The double-domed sapphire crystal has an internal anti-reflective coating that virtually eliminates glare. It creates a slight distortion effect at extreme angles — some collectors love this vintage character, while others prefer the flat look. The screw-down crown operates smoothly with clearly defined positions for winding, date-setting, and time-setting.
Movement: Calibre 400 vs Calibre 733
This is where you need to make a critical buying decision. The Aquis comes with two movement options, and the difference is substantial.
Calibre 400 (In-House)
The Calibre 400 is genuinely impressive. Oris developed this movement from scratch, and it shows. The 120-hour (5-day) power reserve means you can take the watch off on Friday evening and strap it back on Monday morning without needing to reset it. It’s also antimagnetic to over 2,250 gauss, which matters for anyone who uses smartphones, laptops, or tablet covers with magnetic closures near their wrist.
Accuracy is rated at ±3 seconds per day from the factory, which matches COSC chronometer standards — though Oris chose not to submit for official COSC certification. The 10-year recommended service interval (backed by a 10-year warranty) is industry-leading and reflects genuine confidence in the movement’s durability.
Calibre 733 (Modified Sellita SW200-1)
The Calibre 733 is a workhorse. It’s a proven, reliable movement used across the Swiss watch industry, with a 38-hour power reserve and typical accuracy of ±12 seconds per day. It’s perfectly adequate, and it’s what you’ll find in many watches costing significantly more than the Aquis. The key advantage is price: the Cal. 733 Aquis starts around $2,100 on rubber and $2,300 on bracelet — roughly $1,200 less than the Cal. 400 version.
On the Wrist
At 41.5mm with a 47.5mm lug-to-lug, the Aquis wears like a modern dive watch — present but not overbearing. The 13.4mm thickness keeps the profile reasonable, and the curved caseback sits comfortably against the wrist. The short, curved lugs mean it works surprisingly well on wrists as small as 6.5 inches.
The steel bracelet deserves special mention. It features a quick-adjust extension system built into the clasp that lets you add roughly 14mm of length without tools — perfect for wearing over a thin wetsuit or accommodating wrist swelling in warm weather. The taper from 22mm at the lugs to 18mm at the clasp gives it a refined look that transitions well from dive gear to business casual.
If you prefer rubber, Oris’s proprietary strap system makes swapping between bracelet and strap a tool-free affair. The molded rubber strap is comfortable from day one and doesn’t trap moisture the way some rubber straps do.
Value & Pricing
Here’s where the Oris Aquis really makes its case. Let’s put the numbers in context:
The Calibre 400 Aquis on bracelet retails for approximately $3,500. For that money, you get an in-house movement with a 5-day power reserve, 10-year warranty, ceramic bezel, 300m water resistance, and excellent build quality. The closest competitors offering similar specifications are the Omega Seamaster 300M at $5,500+ and the Tudor Pelagos at $4,500+.
The Calibre 733 version on rubber at roughly $2,100 is perhaps the sharpest value proposition in Swiss dive watches today. You sacrifice the in-house movement and extended power reserve, but the case, dial, bezel, and overall build quality are identical to the Cal. 400 version.
On the pre-owned market, Cal. 400 models trade between $2,400 and $2,800, while Cal. 733 models can be found for $1,200 to $1,600 — making either version an exceptional used buy. Check current prices on Amazon.
How It Compares
| Feature | Oris Aquis Cal. 400 | Omega Seamaster 300M | Tudor BB58 | Seiko Prospex SPB143 |
|---|---|---|---|---|
| Price (MSRP) | $3,500 | $5,500 | $3,975 | $1,200 |
| Case Size | 41.5mm | 42mm | 39mm | 40.5mm |
| Movement | In-House Cal. 400 | Co-Axial 8800 | In-House MT5402 | 6R35 |
| Power Reserve | 120 hours | 55 hours | 70 hours | 70 hours |
| Water Resistance | 300m | 300m | 200m | 200m |
| Warranty | 10 years | 5 years | 5 years | 3 years |
| Bezel | Ceramic | Ceramic | Aluminum | Steel |
| Antimagnetic | Yes (2,250+ gauss) | Yes (15,000 gauss) | No | No |
The Oris punches well above its price in this comparison. While the Omega Seamaster 300M offers Master Chronometer certification and superior antimagnetic protection, the Aquis Cal. 400 actually beats it on power reserve and warranty length at $2,000 less. Against the Tudor BB58, the Aquis offers more water resistance, a ceramic bezel, and longer power reserve for less money.
For budget-conscious buyers, the Seiko alternatives are excellent but operate in a different tier of finishing and movement sophistication. The Aquis Cal. 733 version at $2,100 bridges the gap nicely between Japanese and top-tier Swiss offerings. Browse Oris Aquis options on Amazon.
Who Should Buy This Watch
Buy the Aquis Cal. 400 if: You want the best in-house Swiss dive watch under $4,000, you value long power reserve and extended warranty, or you’re looking for a one-watch collection piece that handles everything from the ocean to the office.
Buy the Aquis Cal. 733 if: You want Swiss dive-watch quality under $2,500, you don’t mind a modified Sellita movement, or you’re looking for a beater dive watch with genuine credentials.
Look elsewhere if: You need brand recognition on par with Rolex or Omega (Oris is still a niche brand among non-enthusiasts), you want a sub-40mm case (the 39.5mm Aquis exists but is harder to find), or you prefer vintage-styled dive watches (check the Tudor Black Bay instead).
Frequently Asked Questions
The Oris Aquis isn’t a watch you buy for appreciation — it’s a watch you buy to wear. That said, Oris holds value reasonably well on the pre-owned market, with Calibre 400 models retaining roughly 65-75% of retail. The brand’s growing reputation and limited production compared to Swatch Group brands work in its favor for long-term value retention.
For most buyers, yes. The Calibre 400 adds a 5-day power reserve (vs. 38 hours), antimagnetic protection, a 10-year warranty (vs. 2 years), and chronometer-grade accuracy. The roughly $1,200 premium buys significant upgrades that you’ll appreciate daily. However, the Cal. 733 is perfectly reliable and represents sharper value if budget is your primary concern.
For wrists 6.0-6.75 inches, the 39.5mm is ideal. For wrists 6.75-7.5 inches, the 41.5mm is the sweet spot and the most popular choice. For wrists over 7.5 inches, the 43.5mm provides balanced proportions. Try before you buy if possible — the integrated bracelet design means the watch wears slightly larger than its diameter suggests.
Absolutely. The Aquis is rated to 300 meters (30 bar), which makes it suitable for recreational scuba diving, swimming, snorkeling, and any water sport. The screw-down crown and unidirectional bezel are designed for actual underwater use, not just splash resistance.
The Omega Seamaster 300M offers Master Chronometer certification, superior antimagnetic protection (15,000 gauss), and stronger brand recognition. However, the Oris Aquis Cal. 400 counters with a longer power reserve (120 vs. 55 hours), a longer warranty (10 vs. 5 years), and a significantly lower price ($3,500 vs. $5,500+). Both are excellent dive watches — the Oris is the smarter buy on pure specifications-per-dollar.
Oris watches are designed and assembled in Hölstein, Switzerland, in the canton of Basel-Landschaft. The company has been making watches at this location since 1904. The Calibre 400 movement is developed and manufactured in-house at their Swiss facility, making Oris one of the few independent Swiss watchmakers producing their own movements.
Oris watches typically depreciate 25-35% from retail on the pre-owned market, which is actually competitive with brands like Longines and TAG Heuer. The Calibre 400 models are showing stronger value retention than older Sellita-powered versions, likely due to the in-house movement’s appeal among collectors. While Oris won’t appreciate like a Rolex, it offers better retention than most watches in its price range.
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- Tudor Black Bay 41 Review (2026)
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Find more watch reviews, comparisons, and buying guides on The Watchology.
This article was researched with the help of AI. While we strive to keep all information accurate and up to date, there may be errors. If you notice any discrepancies, please contact us.
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