Hamilton Khaki Aviation Pilot Auto vs Oris Aquis Date Calibre 400
Hamilton's pilot watch meets Oris's diver
Quick Verdict
The Hamilton Khaki Aviation Pilot Auto ($1,000–$1,500) offers Hamilton/ETA Automatic precision in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Khaki Aviation Pilot Auto 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.
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Specifications Compared
| Feature | Hamilton Khaki Aviation Pilot Auto | Oris Aquis Date Calibre 400 |
|---|---|---|
| Price | $1,000–$1,500 | $2,500–$5,000 |
| Case Size | 38mm | 41.5mm |
| Movement | Automatic H-10 (ETA 2824-2 base) | Automatic Calibre 400 |
| Caliber Type | Hamilton/ETA Automatic | 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 Aviation Pilot Auto 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 (ETA 2824-2 base) vs Automatic Calibre 400
The Khaki Aviation Pilot Auto runs the Automatic H-10 (ETA 2824-2 base) (Hamilton/ETA Automatic, 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 Aviation Pilot Auto 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 Aviation Pilot Auto 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 Khaki Aviation Pilot Auto 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 Aviation Pilot Auto 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.
Our Verdict
Hamilton
Khaki Aviation Pilot Auto
Choose the Hamilton Khaki Aviation Pilot Auto if you prioritize Hamilton/ETA Automatic engineering, Swiss Made craftsmanship, and 100m (10 ATM) water resistance. At $1,000–$1,500, it delivers Automatic H-10 (ETA 2824-2 base) 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 Aviation Pilot Auto 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
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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.