Oris Aquis Date Calibre 400 vs Zenith Chronomaster El Primero
Oris's diver meets Zenith's chronograph
Quick Verdict
The Oris Aquis Date Calibre 400 ($2,500–$5,000) offers Oris In-House Manufacture precision in the tier below the Zenith Chronomaster El Primero ($5,000–$10,000). The Aquis Date Calibre 400 measures 41.5mm and is rated 300m (30 ATM). The Chronomaster El Primero counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Zenith Chronomaster El Primero |
|---|---|---|
| Price | $2,500–$5,000 | $5,000–$10,000 |
| Case Size | 41.5mm | 38mm |
| Movement | Automatic Calibre 400 | Automatic El Primero 3600 (5Hz) |
| Caliber Type | Oris In-House Manufacture | In-House Automatic Chronograph Manufacture |
| Power Reserve | 120 Hours (5 Days) | 60 Hours |
| Water Resistance | 300m (30 ATM) | 50m (5 ATM) |
| Crystal | Sapphire Crystal with Anti-Reflective Coating | Domed Sapphire |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Oris's design language vs Zenith's approach
The Oris Aquis Date Calibre 400 features a Stainless Steel case at 41.5mm with Sapphire Crystal with Anti-Reflective Coating protection. The Zenith Chronomaster El Primero offers Stainless Steel construction at 38mm with Domed Sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Calibre 400 vs Automatic El Primero 3600 (5Hz)
The Aquis Date Calibre 400 runs the Automatic Calibre 400 (Oris In-House Manufacture, 120 Hours (5 Days) power reserve) at 28,800 vph (4 Hz) frequency. The Chronomaster El Primero uses the Automatic El Primero 3600 (5Hz) (In-House Automatic Chronograph Manufacture, 60 Hours reserve) at 36,000 vph (5 Hz). The Aquis Date Calibre 400 edges ahead on power reserve.
Wearability & Fit
41.5mm vs 38mm — different wrist presence
At 41.5mm, the Aquis Date Calibre 400 has a bolder wrist presence compared to the Chronomaster El Primero at 38mm. Water resistance differs: 300m (30 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Oris sits in the lower tier
The Oris Aquis Date Calibre 400 sits at $2,500–$5,000 and the Zenith Chronomaster El Primero at $5,000–$10,000. On the specs that outlast any price: the Aquis Date Calibre 400 uses Sapphire Crystal with Anti-Reflective Coating with 120 Hours (5 Days), against Domed Sapphire and 60 Hours on the Chronomaster El Primero. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 50m (5 ATM)
The Aquis Date Calibre 400 is rated to 300m (30 ATM) while the Chronomaster El Primero handles 50m (5 ATM). The Aquis Date Calibre 400 is better suited for water activities.
Materials Face-Off
| Component | Oris Aquis Date Calibre 400 | Zenith Chronomaster El Primero |
|---|---|---|
| Movement | Oris Caliber 733 | Zenith El Primero 3600 |
| Crystal | Domed sapphire with anti-reflective coating on inside | Domed sapphire with anti-reflective coating |
| Case | Stainless steel 316L (brushed and polished) | Stainless steel |
| Bezel | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip | Fixed polished steel |
Cost of Ownership Compared
The Oris Aquis Date Calibre 400 saves you $6,742 over 5 years of ownership
Who Should Pick Which
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
Pick the Zenith Chronomaster El Primero if…
- Buyers wanting a true in-house manufacture chronograph — the El Primero is one of the three original automatic chronograph movements (1969)
- High-beat movement enthusiasts — 5 Hz / 36,000 vph gives a uniquely smooth sweep and 1/10th-second timing precision
- Smaller-wristed buyers — 38mm wears elegantly on 6"–7" wrists, rare in the chronograph category
- Heritage collectors — the Charles Vermot story (secretly preserving the caliber from corporate destruction) is one of horology's greatest narratives
- Practical daily wearers — 60-hour power reserve gives weekend-off breathing room
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.
Zenith Chronomaster El Primero
- 19mm lug awkward for aftermarket.
- 1/10 second chronograph means seconds hand rotates faster — can confuse first-time users.
- 50m WR despite expensive watch.
Our Verdict
Oris
Aquis Date Calibre 400
Choose the Oris Aquis Date Calibre 400 if you prioritize Oris In-House Manufacture engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Calibre 400 with 120 Hours (5 Days) power reserve.
Check Price on AmazonZenith
Chronomaster El Primero
Choose the Zenith Chronomaster El Primero if you value In-House Automatic Chronograph Manufacture technology, Swiss Made heritage, and 38mm proportions. At $5,000–$10,000, the Automatic El Primero 3600 (5Hz) with 60 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Oris Aquis Date Calibre 400 and Zenith Chronomaster El Primero represent two distinct approaches to fine watchmaking — the Oris bringing Swiss Made tradition while Zenith 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.