Oris Aquis Date Calibre 400 vs Seiko Prospex Samurai SRPF03
Two divers compared — $2,500–$5,000 vs $250–$500
Quick Verdict
The Seiko Prospex Samurai SRPF03 ($250–$500) delivers Seiko Automatic, hand-winding and hacking technology in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Prospex Samurai SRPF03 measures 43.8mm and is rated 200m (20 ATM). The Aquis Date Calibre 400 justifies its premium with Swiss Made heritage and Automatic Calibre 400. Both represent excellent choices in the diver category.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Seiko Prospex Samurai SRPF03 |
|---|---|---|
| Price | $2,500–$5,000 | $250–$500 |
| Case Size | 41.5mm | 43.8mm |
| Movement | Automatic Calibre 400 | Automatic Caliber 4R35 |
| Caliber Type | Oris In-House Manufacture | Seiko Automatic, hand-winding and hacking |
| Power Reserve | 120 Hours (5 Days) | 41 Hours |
| Water Resistance | 300m (30 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal with Anti-Reflective Coating | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Japanese Movement |
Category-by-Category Analysis
Design & Aesthetics
Oris's design language vs Seiko'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 Seiko Prospex Samurai SRPF03 offers Stainless Steel construction at 43.8mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Calibre 400 vs Automatic Caliber 4R35
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 Prospex Samurai SRPF03 uses the Automatic Caliber 4R35 (Seiko Automatic, hand-winding and hacking, 41 Hours reserve) at 21,600 vph (3 Hz). The Aquis Date Calibre 400 edges ahead on power reserve.
Wearability & Fit
41.5mm vs 43.8mm — different wrist presence
At 41.5mm, the Aquis Date Calibre 400 wears more compactly on smaller wrists compared to the Prospex Samurai SRPF03 at 43.8mm. Water resistance differs: 300m (30 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Oris Aquis Date Calibre 400 sits at $2,500–$5,000 and the Seiko Prospex Samurai SRPF03 at $250–$500. 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 Hardlex Crystal and 41 Hours on the Prospex Samurai SRPF03. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 200m (20 ATM)
The Aquis Date Calibre 400 is rated to 300m (30 ATM) while the Prospex Samurai SRPF03 handles 200m (20 ATM). The Aquis Date Calibre 400 is better suited for water activities.
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 AmazonSeiko
Prospex Samurai SRPF03
Choose the Seiko Prospex Samurai SRPF03 if you value Seiko Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 43.8mm proportions. At $250–$500, the Automatic Caliber 4R35 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Oris Aquis Date Calibre 400 and Seiko Prospex Samurai SRPF03 represent two distinct approaches to the diver category — the Oris bringing Swiss Made tradition while Seiko delivers Japanese Movement engineering.
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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.