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 (~$2,595) offers Oris In-House Manufacture precision at $5,305 less than the Zenith Chronomaster El Primero (~$7,900). The Chronomaster El Primero counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective price points.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Zenith Chronomaster El Primero |
|---|---|---|
| Price | ~$2,595 | ~$7,900 |
| 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
Movement & Performance
Automatic Calibre 400 vs Automatic El Primero 3600 (5Hz)
Wearability & Fit
41.5mm vs 38mm — different wrist presence
Value & Cost of Ownership
Oris is $5,305 more affordable
Water Resistance
300m (30 ATM) vs 50m (5 ATM)
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 $2,300 — 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 ~$2,595, 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 ~$7,900, 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.