Seiko 5 Sports GMT SSK001 vs Seiko Prospex 62MAS Modern Re-interpretation
Seiko's GMT watch meets Seiko's diver
Quick Verdict
The Seiko 5 Sports GMT SSK001 ($250–$500) offers Seiko In-House Automatic GMT precision in the tier below the Seiko Prospex 62MAS Modern Re-interpretation ($1,000–$1,500). The 5 Sports GMT SSK001 measures 42.5mm and is rated 100m (10 ATM). The Prospex 62MAS Modern Re-interpretation counters with Made in Japan craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Seiko 5 Sports GMT SSK001 | Seiko Prospex 62MAS Modern Re-interpretation |
|---|---|---|
| Price | $250–$500 | $1,000–$1,500 |
| Case Size | 42.5mm | 40.5mm |
| Movement | Automatic Caliber 4R34 (True GMT) | Automatic 6R35 |
| Caliber Type | Seiko In-House Automatic GMT | Seiko In-House Automatic |
| Power Reserve | 41 Hours | 70 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) |
| Crystal | Hardlex Crystal | Sapphire |
| Case Material | Stainless Steel | Stainless Steel with Super-Hard Coating |
| Origin | Made in Japan | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Seiko's approach
The Seiko 5 Sports GMT SSK001 features a Stainless Steel case at 42.5mm with Hardlex Crystal protection. The Seiko Prospex 62MAS Modern Re-interpretation offers Stainless Steel with Super-Hard Coating construction at 40.5mm with Sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R34 (True GMT) vs Automatic 6R35
The 5 Sports GMT SSK001 runs the Automatic Caliber 4R34 (True GMT) (Seiko In-House Automatic GMT, 41 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Prospex 62MAS Modern Re-interpretation uses the Automatic 6R35 (Seiko In-House Automatic, 70 Hours reserve) at 21,600 vph (3 Hz). The Prospex 62MAS Modern Re-interpretation offers a longer power reserve.
Wearability & Fit
42.5mm vs 40.5mm — different wrist presence
At 42.5mm, the 5 Sports GMT SSK001 has a bolder wrist presence compared to the Prospex 62MAS Modern Re-interpretation at 40.5mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Seiko 5 Sports GMT SSK001 sits at $250–$500 and the Seiko Prospex 62MAS Modern Re-interpretation at $1,000–$1,500. On the specs that outlast any price: the 5 Sports GMT SSK001 uses Hardlex Crystal with 41 Hours, against Sapphire and 70 Hours on the Prospex 62MAS Modern Re-interpretation. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m (20 ATM)
The 5 Sports GMT SSK001 is rated to 100m (10 ATM) while the Prospex 62MAS Modern Re-interpretation handles 200m (20 ATM). The Prospex 62MAS Modern Re-interpretation offers superior water resistance.
Our Verdict
Seiko
5 Sports GMT SSK001
Choose the Seiko 5 Sports GMT SSK001 if you prioritize Seiko In-House Automatic GMT engineering, Made in Japan craftsmanship, and 100m (10 ATM) water resistance. At $250–$500, it delivers Automatic Caliber 4R34 (True GMT) with 41 Hours power reserve.
Check Price on AmazonSeiko
Prospex 62MAS Modern Re-interpretation
Choose the Seiko Prospex 62MAS Modern Re-interpretation if you value Seiko In-House Automatic technology, Made in Japan heritage, and 40.5mm proportions. At $1,000–$1,500, the Automatic 6R35 with 70 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko 5 Sports GMT SSK001 and Seiko Prospex 62MAS Modern Re-interpretation represent two distinct approaches to fine watchmaking — the Seiko bringing Made in Japan tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
More Comparisons
Oris Aquis vs Seiko SPB143 (62MAS)
Swiss independence meets Japanese precision diving
Tag Heuer Carrera Chronograph vs Seiko 5 Sports GMT SSK001
Tag Heuer's chronograph meets Seiko's GMT watch
Tag Heuer Carrera Chronograph vs Seiko Prospex 62MAS Modern Re-interpretation
Tag Heuer's chronograph meets Seiko's diver
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.