Oris Aquis Date Calibre 400 vs Seiko Presage SSA425 Open Heart
Oris's diver meets Seiko's timepiece
Quick Verdict
The Seiko Presage SSA425 Open Heart ($250–$500) delivers Seiko In-House Automatic technology in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Aquis Date Calibre 400 justifies its premium with Swiss Made heritage and Automatic Calibre 400. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Seiko Presage SSA425 Open Heart |
|---|---|---|
| Price | $2,500–$5,000 | $250–$500 |
| Case Size | 41.5mm | 40.5mm |
| Movement | Automatic Calibre 400 | Automatic Caliber 4R38 |
| Caliber Type | Oris In-House Manufacture | Seiko In-House Automatic |
| Power Reserve | 120 Hours (5 Days) | 41 Hours |
| Water Resistance | 300m (30 ATM) | 50m (5 ATM) |
| Crystal | Sapphire Crystal with Anti-Reflective Coating | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
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 Presage SSA425 Open Heart offers Stainless Steel construction at 40.5mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Calibre 400 vs Automatic Caliber 4R38
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 Presage SSA425 Open Heart uses the Automatic Caliber 4R38 (Seiko In-House Automatic, 41 Hours reserve) at 21,600 vph (3 Hz). The Aquis Date Calibre 400 edges ahead on power reserve.
Wearability & Fit
41.5mm vs 40.5mm — different wrist presence
At 41.5mm, the Aquis Date Calibre 400 has a bolder wrist presence compared to the Presage SSA425 Open Heart at 40.5mm. Water resistance differs: 300m (30 ATM) vs 50m (5 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 Presage SSA425 Open Heart 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 Presage SSA425 Open Heart. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 50m (5 ATM)
The Aquis Date Calibre 400 is rated to 300m (30 ATM) while the Presage SSA425 Open Heart handles 50m (5 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
Presage SSA425 Open Heart
Choose the Seiko Presage SSA425 Open Heart if you value Seiko In-House Automatic technology, Made in Japan heritage, and 40.5mm proportions. At $250–$500, the Automatic Caliber 4R38 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Oris Aquis Date Calibre 400 and Seiko Presage SSA425 Open Heart represent two distinct approaches to fine watchmaking — the Oris bringing Swiss Made tradition while Seiko delivers Made in Japan 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.