Mido Ocean Star GMT vs Oris Aquis Date Calibre 400
Two divers compared — $1,000–$1,500 vs $2,500–$5,000
Quick Verdict
The Mido Ocean Star GMT ($1,000–$1,500) offers Automatic (ETA C07.661 base) precision in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Ocean Star GMT measures 44mm and is rated 200m (20 ATM). The Aquis Date Calibre 400 counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional divers for their respective tiers.
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Specifications Compared
| Feature | Mido Ocean Star GMT | Oris Aquis Date Calibre 400 |
|---|---|---|
| Price | $1,000–$1,500 | $2,500–$5,000 |
| Case Size | 44mm | 41.5mm |
| Movement | Automatic Caliber 80 (Base ETA C07.661) | Automatic Calibre 400 |
| Caliber Type | Automatic (ETA C07.661 base) | Oris In-House Manufacture |
| Power Reserve | 80 Hours | 120 Hours (5 Days) |
| Water Resistance | 200m (20 ATM) | 300m (30 ATM) |
| Crystal | Sapphire with Double-sided AR | Sapphire Crystal with Anti-Reflective Coating |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Mido's design language vs Oris's approach
The Mido Ocean Star GMT features a Stainless Steel case at 44mm with Sapphire with Double-sided AR protection. The Oris Aquis Date Calibre 400 offers Stainless Steel construction at 41.5mm with Sapphire Crystal with Anti-Reflective Coating. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 80 (Base ETA C07.661) vs Automatic Calibre 400
The Ocean Star GMT runs the Automatic Caliber 80 (Base ETA C07.661) (Automatic (ETA C07.661 base), 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Aquis Date Calibre 400 uses the Automatic Calibre 400 (Oris In-House Manufacture, 120 Hours (5 Days) reserve) at 28,800 vph (4 Hz). The Aquis Date Calibre 400 offers a longer power reserve.
Wearability & Fit
44mm vs 41.5mm — different wrist presence
At 44mm, the Ocean Star GMT has a bolder wrist presence compared to the Aquis Date Calibre 400 at 41.5mm. Water resistance differs: 200m (20 ATM) vs 300m (30 ATM).
Value & Cost of Ownership
Mido sits in the lower tier
The Mido Ocean Star GMT sits at $1,000–$1,500 and the Oris Aquis Date Calibre 400 at $2,500–$5,000. On the specs that outlast any price: the Ocean Star GMT uses Sapphire with Double-sided AR with 80 Hours, against Sapphire Crystal with Anti-Reflective Coating and 120 Hours (5 Days) on the Aquis Date Calibre 400. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 300m (30 ATM)
The Ocean Star GMT is rated to 200m (20 ATM) while the Aquis Date Calibre 400 handles 300m (30 ATM). The Aquis Date Calibre 400 offers superior water resistance.
Materials Face-Off
| Component | Mido Ocean Star GMT | Oris Aquis Date Calibre 400 |
|---|---|---|
| Case alloy | Stainless steel 316L | Oris Caliber 733 |
| Crystal | Synthetic sapphire grown via Verneuil process, Mohs 9. Double-sided AR coating — uncommon at this price tier, provides exceptionally clear dial readi Mohs 9 | Domed sapphire with anti-reflective coating on inside |
| Bezel insert | Ceramic (ZrO₂) — scratchproof, color-stable. Engraved 24-hour scale | Stainless steel 316L (brushed and polished) |
| Lume specification | Super-LumiNova (variant-dependent grade) | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip |
| Bracelet alloy | Stainless steel 316L | — |
Cost of Ownership Compared
The Mido Ocean Star GMT saves you $1,233 over 5 years of ownership
Who Should Pick Which
Pick the Mido Ocean Star GMT if…
- Enthusiasts wanting proven Swiss/Japanese quality in the $1,000–$2,000 sweet spot
- Dive watch enthusiasts — 200m water resistance is proper dive spec
- Weekend warriors — 80-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
Pick the Oris Aquis Date Calibre 400 if…
- Dive watch enthusiasts — 300m water resistance is proper dive spec
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
- Buyers who prefer a commanding wrist presence — 43mm case
Mido Ocean Star GMT
- 44mm wears large — too big for under-7" wrists
- ETA base movement at this price — fair value but not in-house prestige
- Crystal AR coating can show fingerprints — double-sided AR is a quality upgrade but requires more frequent wipe-downs
- Bracelet quality is adequate not exceptional — most owners report the bracelet is the watch's weak point; aftermarket rubber/MN straps significantly upgrade daily wear
Oris Aquis Date Calibre 400
- Sellita base movement at this price — fair value but not in-house prestige (Caliber 400 variants resolve).
- 43.5mm large for smaller wrists (smaller variants available).
- Proprietary endlinks limit strap options.
Our Verdict
Mido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you prioritize Automatic (ETA C07.661 base) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At $1,000–$1,500, it delivers Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve.
Check Price on AmazonOris
Aquis Date Calibre 400
Choose the Oris Aquis Date Calibre 400 if you value Oris In-House Manufacture technology, Swiss Made heritage, and 41.5mm proportions. At $2,500–$5,000, the Automatic Calibre 400 with 120 Hours (5 Days) power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Mido Ocean Star GMT and Oris Aquis Date Calibre 400 represent two distinct approaches to the diver category — the Mido bringing Swiss Made tradition while Oris delivers Swiss Made engineering.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.