Citizen Tsuyosa Automatic (Green Dial) vs Seiko 5 Sports GMT SSK001
Citizen's timepiece meets Seiko's GMT watch
Quick Verdict
The Citizen Tsuyosa Automatic (Green Dial) ($250–$500) and Seiko 5 Sports GMT SSK001 ($250–$500) are closely matched timepieces at similar price points. The Tsuyosa Automatic (Green Dial) emphasizes Citizen/Miyota In-House Automatic engineering while the 5 Sports GMT SSK001 focuses on Made in Japan craftsmanship.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Citizen Tsuyosa Automatic (Green Dial) | Seiko 5 Sports GMT SSK001 |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 40mm | 42.5mm |
| Movement | Automatic Caliber 8210 | Automatic Caliber 4R34 (True GMT) |
| Caliber Type | Citizen/Miyota In-House Automatic | Seiko In-House Automatic GMT |
| Power Reserve | 40 Hours | 41 Hours |
| Water Resistance | 50m (5 ATM) | 100m (10 ATM) |
| Crystal | Sapphire Crystal with Cyclops | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Citizen's design language vs Seiko's approach
The Citizen Tsuyosa Automatic (Green Dial) features a Stainless Steel case at 40mm with Sapphire Crystal with Cyclops protection. The Seiko 5 Sports GMT SSK001 offers Stainless Steel construction at 42.5mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 8210 vs Automatic Caliber 4R34 (True GMT)
The Tsuyosa Automatic (Green Dial) runs the Automatic Caliber 8210 (Citizen/Miyota In-House Automatic, 40 Hours power reserve) at 21,600 vph (3 Hz) frequency. The 5 Sports GMT SSK001 uses the Automatic Caliber 4R34 (True GMT) (Seiko In-House Automatic GMT, 41 Hours reserve) at 21,600 vph (3 Hz). The 5 Sports GMT SSK001 offers a longer power reserve.
Wearability & Fit
40mm vs 42.5mm — different wrist presence
At 40mm, the Tsuyosa Automatic (Green Dial) wears more compactly on smaller wrists compared to the 5 Sports GMT SSK001 at 42.5mm. Water resistance differs: 50m (5 ATM) vs 100m (10 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Citizen Tsuyosa Automatic (Green Dial) sits at $250–$500 and the Seiko 5 Sports GMT SSK001 at $250–$500. On the specs that outlast any price: the Tsuyosa Automatic (Green Dial) uses Sapphire Crystal with Cyclops with 40 Hours, against Hardlex Crystal and 41 Hours on the 5 Sports GMT SSK001. Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 100m (10 ATM)
The Tsuyosa Automatic (Green Dial) is rated to 50m (5 ATM) while the 5 Sports GMT SSK001 handles 100m (10 ATM). The 5 Sports GMT SSK001 offers superior water resistance.
Our Verdict
Citizen
Tsuyosa Automatic (Green Dial)
Choose the Citizen Tsuyosa Automatic (Green Dial) if you prioritize Citizen/Miyota In-House Automatic engineering, Made in Japan craftsmanship, and 50m (5 ATM) water resistance. At $250–$500, it delivers Automatic Caliber 8210 with 40 Hours power reserve.
Check Price on AmazonSeiko
5 Sports GMT SSK001
Choose the Seiko 5 Sports GMT SSK001 if you value Seiko In-House Automatic GMT technology, Made in Japan heritage, and 42.5mm proportions. At $250–$500, the Automatic Caliber 4R34 (True GMT) with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Citizen Tsuyosa Automatic (Green Dial) and Seiko 5 Sports GMT SSK001 represent two distinct approaches to fine watchmaking — the Citizen bringing Made in Japan tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
More Comparisons
Citizen Tsuyosa Green vs Seiko 5 Sports
Sapphire and 50m against Hardlex and 100m
Tag Heuer Carrera Chronograph vs Citizen Tsuyosa Automatic (Green Dial)
Tag Heuer's chronograph meets Citizen's timepiece
Tag Heuer Carrera Chronograph vs Seiko 5 Sports GMT SSK001
Tag Heuer's chronograph meets Seiko's GMT watch
Explore These Watches
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.