Citizen Promaster Sea Eco-Drive Diver vs Oris Aquis Date Calibre 400
Two divers compared — $250–$500 vs $2,500–$5,000
Quick Verdict
The Citizen Promaster Sea Eco-Drive Diver ($250–$500) offers Citizen Eco-Drive (Solar Quartz) precision in the tier below the Oris Aquis Date Calibre 400 ($2,500–$5,000). The Promaster Sea Eco-Drive Diver measures 44mm and is rated 200m (20 ATM) ISO 6425. The Aquis Date Calibre 400 counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional divers for their respective tiers.
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Specifications Compared
| Feature | Citizen Promaster Sea Eco-Drive Diver | Oris Aquis Date Calibre 400 |
|---|---|---|
| Price | $250–$500 | $2,500–$5,000 |
| Case Size | 44mm | 41.5mm |
| Movement | Eco-Drive Caliber E168 | Automatic Calibre 400 |
| Caliber Type | Citizen Eco-Drive (Solar Quartz) | Oris In-House Manufacture |
| Power Reserve | — | 120 Hours (5 Days) |
| Water Resistance | 200m (20 ATM) ISO 6425 | 300m (30 ATM) |
| Crystal | Mineral Crystal | Sapphire Crystal with Anti-Reflective Coating |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Citizen's design language vs Oris's approach
The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral 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
Eco-Drive Caliber E168 vs Automatic Calibre 400
The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard 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
44mm vs 41.5mm — different wrist presence
At 44mm, the Promaster Sea Eco-Drive Diver has a bolder wrist presence compared to the Aquis Date Calibre 400 at 41.5mm. Water resistance differs: 200m (20 ATM) ISO 6425 vs 300m (30 ATM).
Value & Cost of Ownership
Citizen sits in the lower tier
The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Oris Aquis Date Calibre 400 at $2,500–$5,000. On the specs that outlast any price: the Promaster Sea Eco-Drive Diver uses Mineral Crystal with a standard reserve, 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
200m (20 ATM) ISO 6425 vs 300m (30 ATM)
The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the Aquis Date Calibre 400 handles 300m (30 ATM). The Aquis Date Calibre 400 offers superior water resistance.
Our Verdict
Citizen
Promaster Sea Eco-Drive Diver
Choose the Citizen Promaster Sea Eco-Drive Diver if you prioritize Citizen Eco-Drive (Solar Quartz) engineering, Made in Japan craftsmanship, and 200m (20 ATM) ISO 6425 water resistance. At $250–$500, it delivers Eco-Drive Caliber E168 with solid 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 Citizen Promaster Sea Eco-Drive Diver and Oris Aquis Date Calibre 400 represent two distinct approaches to the diver category — the Citizen bringing Made in Japan 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.