Citizen Promaster Sea Eco-Drive Diver vs Hamilton Intra-Matic Auto Chronograph
Citizen's diver meets Hamilton's chronograph
Quick Verdict
The Citizen Promaster Sea Eco-Drive Diver ($250–$500) offers Citizen Eco-Drive (Solar Quartz) precision in the tier below the Hamilton Intra-Matic Auto Chronograph ($2,500–$5,000). The Promaster Sea Eco-Drive Diver measures 44mm and is rated 200m (20 ATM) ISO 6425. The Intra-Matic Auto Chronograph counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Citizen Promaster Sea Eco-Drive Diver | Hamilton Intra-Matic Auto Chronograph |
|---|---|---|
| Price | $250–$500 | $2,500–$5,000 |
| Case Size | 44mm | 40mm |
| Movement | Eco-Drive Caliber E168 | Automatic H-31 |
| Caliber Type | Citizen Eco-Drive (Solar Quartz) | Valjoux-Based Automatic Chronograph |
| Power Reserve | — | 60 Hours |
| Water Resistance | 200m (20 ATM) ISO 6425 | 100m (10 ATM) |
| Crystal | Mineral Crystal | Sapphire (Domed) |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Citizen's design language vs Hamilton's approach
The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral Crystal protection. The Hamilton Intra-Matic Auto Chronograph offers Stainless Steel construction at 40mm with Sapphire (Domed). Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Eco-Drive Caliber E168 vs Automatic H-31
The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard frequency. The Intra-Matic Auto Chronograph uses the Automatic H-31 (Valjoux-Based Automatic Chronograph, 60 Hours reserve) at 28,800 vph (4 Hz). The Intra-Matic Auto Chronograph offers a longer power reserve.
Wearability & Fit
44mm vs 40mm — different wrist presence
At 44mm, the Promaster Sea Eco-Drive Diver has a bolder wrist presence compared to the Intra-Matic Auto Chronograph at 40mm. Water resistance differs: 200m (20 ATM) ISO 6425 vs 100m (10 ATM).
Value & Cost of Ownership
Citizen sits in the lower tier
The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Hamilton Intra-Matic Auto Chronograph 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 (Domed) and 60 Hours on the Intra-Matic Auto Chronograph. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) ISO 6425 vs 100m (10 ATM)
The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the Intra-Matic Auto Chronograph handles 100m (10 ATM). The Promaster Sea Eco-Drive Diver is better suited for water activities.
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 AmazonHamilton
Intra-Matic Auto Chronograph
Choose the Hamilton Intra-Matic Auto Chronograph if you value Valjoux-Based Automatic Chronograph technology, Swiss Made heritage, and 40mm proportions. At $2,500–$5,000, the Automatic H-31 with 60 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Citizen Promaster Sea Eco-Drive Diver and Hamilton Intra-Matic Auto Chronograph represent two distinct approaches to fine watchmaking — the Citizen bringing Made in Japan tradition while Hamilton 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.