Hamilton Khaki Field Automatic vs Oris Aquis Date Calibre 400
Hamilton's field watch meets Oris's diver
Quick Verdict
The Hamilton Khaki Field Automatic ($500–$1,000) offers Automatic (ETA C07.611 base) precision in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Khaki Field Automatic measures 38mm and is rated 100m (10 ATM). The Aquis Date Calibre 400 counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Hamilton Khaki Field Automatic | Oris Aquis Date Calibre 400 |
|---|---|---|
| Price | $500–$1,000 | $2,500–$5,000 |
| Case Size | 38mm | 41.5mm |
| Movement | Automatic H-10 | Automatic Calibre 400 |
| Caliber Type | Automatic (ETA C07.611 base) | Oris In-House Manufacture |
| Power Reserve | 80 Hours | 120 Hours (5 Days) |
| Water Resistance | 100m (10 ATM) | 300m (30 ATM) |
| Crystal | Sapphire Crystal | Sapphire Crystal with Anti-Reflective Coating |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Hamilton's design language vs Oris's approach
The Hamilton Khaki Field Automatic features a Stainless Steel case at 38mm with Sapphire Crystal 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 H-10 vs Automatic Calibre 400
The Khaki Field Automatic runs the Automatic H-10 (Automatic (ETA C07.611 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
38mm vs 41.5mm — different wrist presence
At 38mm, the Khaki Field Automatic wears more compactly on smaller wrists compared to the Aquis Date Calibre 400 at 41.5mm. Water resistance differs: 100m (10 ATM) vs 300m (30 ATM).
Value & Cost of Ownership
Hamilton sits in the lower tier
The Hamilton Khaki Field Automatic sits at $500–$1,000 and the Oris Aquis Date Calibre 400 at $2,500–$5,000. On the specs that outlast any price: the Khaki Field Automatic uses Sapphire Crystal 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
100m (10 ATM) vs 300m (30 ATM)
The Khaki Field Automatic is rated to 100m (10 ATM) while the Aquis Date Calibre 400 handles 300m (30 ATM). The Aquis Date Calibre 400 offers superior water resistance.
Materials Face-Off
| Component | Hamilton Khaki Field Automatic | Oris Aquis Date Calibre 400 |
|---|---|---|
| Case | Stainless steel, brushed finish. Hamilton does not publish the alloy grade for this reference. | Oris Caliber 733 |
| Crystal | Verneuil-grown sapphire, single-side AR coating. | Domed sapphire with anti-reflective coating on inside |
| Lume | Super-LumiNova on the hands and hour numerals. Hamilton lists "Super Luminova: Yes" for this reference and does not publish a grade, so none is claimed here. | Stainless steel 316L (brushed and polished) |
| Strap | Full-grain leather (varies by reference). | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip |
Cost of Ownership Compared
The Hamilton Khaki Field Automatic saves you $1,955 over 5 years of ownership
Who Should Pick Which
Pick the Hamilton Khaki Field Automatic if…
- Strong value proposition under $1,000 with quality construction
- Active lifestyle wearers — 100m water resistance handles swimming and water sports
- Weekend warriors — 80-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Military/field watch enthusiasts who value legibility and durability
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
Hamilton Khaki Field Automatic
- Same H-10 / C07 movement as Tissot PRX and Mido — paying brand premium for the Hamilton heritage
- 3 Hz "slow" seconds beat (visible 6 ticks/sec vs. 8)
- Strap quality is adequate, not exceptional
- No hacking, but movement is auto-only (no hand-wind on the 80h variant — older H-30 caliber refs had it)
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
Hamilton
Khaki Field Automatic
Choose the Hamilton Khaki Field Automatic if you prioritize Automatic (ETA C07.611 base) engineering, Swiss Made craftsmanship, and 100m (10 ATM) water resistance. At $500–$1,000, it delivers Automatic H-10 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 Hamilton Khaki Field Automatic and Oris Aquis Date Calibre 400 represent two distinct approaches to fine watchmaking — the Hamilton bringing Swiss Made tradition while Oris delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Explore These Watches
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.