Longines HydroConquest Automatic vs Oris Aquis Date Calibre 400
Two divers compared — ~$2,000 vs ~$2,595
Quick Verdict
The Longines HydroConquest Automatic (~$2,000) offers ETA-Based Automatic with Silicon Balance Spring precision at $595 less than the Oris Aquis Date Calibre 400 (~$2,595). The Aquis Date Calibre 400 counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional divers for their respective price points.
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Specifications Compared
| Feature | Longines HydroConquest Automatic | Oris Aquis Date Calibre 400 |
|---|---|---|
| Price | ~$2,000 | ~$2,595 |
| Case Size | 41mm | 41.5mm |
| Movement | Automatic L888.5 | Automatic Calibre 400 |
| Caliber Type | ETA-Based Automatic with Silicon Balance Spring | Oris In-House Manufacture |
| Power Reserve | 72 Hours | 120 Hours (5 Days) |
| Water Resistance | 300m (30 ATM) | 300m (30 ATM) |
| Crystal | Sapphire with Anti-Reflective Coating | Sapphire Crystal with Anti-Reflective Coating |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Longines's design language vs Oris's approach
Movement & Performance
Automatic L888.5 vs Automatic Calibre 400
Wearability & Fit
41mm vs 41.5mm — different wrist presence
Value & Cost of Ownership
Longines is $595 more affordable
Water Resistance
300m (30 ATM) vs 300m (30 ATM)
Materials Face-Off
| Component | Longines HydroConquest Automatic | Oris Aquis Date Calibre 400 |
|---|---|---|
| Ceramic Bezel | Zirconium oxide (ZrO₂) with engraved and paint-filled 60-minute dive scale Mohs 8.5 | Oris Caliber 733 |
| Sapphire Crystal | Flat sapphire with anti-reflective coating on the underside Mohs 9 | Domed sapphire with anti-reflective coating on inside |
| Silicon Balance Spring | Si hairspring in the L888.5 caliber — introduced 2020 across the HydroConquest line | Stainless steel 316L (brushed and polished) |
| 316L Stainless Steel | Brushed flanks with polished bevel edges — mixed finishing for visual depth | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip |
| Super-LumiNova | Applied to sword-style hands and all hour indices | — |
Cost of Ownership Compared
The Longines HydroConquest Automatic saves you $592 over 5 years of ownership
Who Should Pick Which
Pick the Longines HydroConquest Automatic if…
- Best-in-class 72-hour power reserve at sub-$2,000
- Silicon hairspring antimagnetic protection at an accessible price
- Swiss heritage enthusiasts — Longines' 1832 founding and Olympic/aviation history
- Legitimate 300m dive capability with everyday wearability
- Value seekers — at grey-market $1,350 the spec-per-dollar is nearly unbeatable
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
Longines HydroConquest Automatic
- ETA-base movement at $1,750 — excellent but not "in-house" in the purist sense
- 21mm lug width — awkward for aftermarket straps (most are 20mm or 22mm)
- 25,200 vph (3.5 Hz) — seconds hand sweep is less smooth than 28,800 vph competitors
- Not COSC-certified — no chronometer guarantee (unlike Tudor or Omega at similar prices)
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.
Our Verdict
Longines
HydroConquest Automatic
Choose the Longines HydroConquest Automatic if you prioritize ETA-Based Automatic with Silicon Balance Spring engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At ~$2,000, it delivers Automatic L888.5 with 72 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 ~$2,595, the Automatic Calibre 400 with 120 Hours (5 Days) power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Longines HydroConquest Automatic and Oris Aquis Date Calibre 400 represent two distinct approaches to the diver category — the Longines bringing Swiss Made tradition while Oris delivers Swiss Made engineering.