Citizen Promaster Sea Eco-Drive Diver vs Citizen Tsuyosa Automatic (Green Dial)
Citizen's diver meets Citizen's timepiece
Quick Verdict
The Citizen Promaster Sea Eco-Drive Diver ($250–$500) and Citizen Tsuyosa Automatic (Green Dial) ($250–$500) are closely matched timepieces at similar price points. The Promaster Sea Eco-Drive Diver emphasizes Citizen Eco-Drive (Solar Quartz) engineering while the Tsuyosa Automatic (Green Dial) focuses on Made in Japan craftsmanship.
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Specifications Compared
| Feature | Citizen Promaster Sea Eco-Drive Diver | Citizen Tsuyosa Automatic (Green Dial) |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 44mm | 40mm |
| Movement | Eco-Drive Caliber E168 | Automatic Caliber 8210 |
| Caliber Type | Citizen Eco-Drive (Solar Quartz) | Citizen/Miyota In-House Automatic |
| Power Reserve | — | 40 Hours |
| Water Resistance | 200m (20 ATM) ISO 6425 | 50m (5 ATM) |
| Crystal | Mineral Crystal | Sapphire Crystal with Cyclops |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Citizen's design language vs Citizen's approach
The Citizen Promaster Sea Eco-Drive Diver features a Stainless Steel case at 44mm with Mineral Crystal protection. The Citizen Tsuyosa Automatic (Green Dial) offers Stainless Steel construction at 40mm with Sapphire Crystal with Cyclops. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Eco-Drive Caliber E168 vs Automatic Caliber 8210
The Promaster Sea Eco-Drive Diver runs the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard power reserve) at standard frequency. The Tsuyosa Automatic (Green Dial) uses the Automatic Caliber 8210 (Citizen/Miyota In-House Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Tsuyosa Automatic (Green Dial) 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 Tsuyosa Automatic (Green Dial) at 40mm. Water resistance differs: 200m (20 ATM) ISO 6425 vs 50m (5 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Citizen Promaster Sea Eco-Drive Diver sits at $250–$500 and the Citizen Tsuyosa Automatic (Green Dial) at $250–$500. On the specs that outlast any price: the Promaster Sea Eco-Drive Diver uses Mineral Crystal with a standard reserve, against Sapphire Crystal with Cyclops and 40 Hours on the Tsuyosa Automatic (Green Dial). Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) ISO 6425 vs 50m (5 ATM)
The Promaster Sea Eco-Drive Diver is rated to 200m (20 ATM) ISO 6425 while the Tsuyosa Automatic (Green Dial) handles 50m (5 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 AmazonCitizen
Tsuyosa Automatic (Green Dial)
Choose the Citizen Tsuyosa Automatic (Green Dial) if you value Citizen/Miyota In-House Automatic technology, Made in Japan heritage, and 40mm proportions. At $250–$500, the Automatic Caliber 8210 with 40 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Citizen Promaster Sea Eco-Drive Diver and Citizen Tsuyosa Automatic (Green Dial) represent two distinct approaches to fine watchmaking — the Citizen bringing Made in Japan tradition while Citizen 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.