Seiko 5 Sports GMT SSK001 vs Seiko Prospex Alpinist
Seiko's GMT watch meets Seiko's diver
Quick Verdict
The Seiko 5 Sports GMT SSK001 (~$495) offers Seiko In-House Automatic GMT precision at $125 less than the Seiko Prospex Alpinist (~$620). The Prospex Alpinist counters with Made in Japan craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective price points.
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 Alpinist |
|---|---|---|
| Price | ~$495 | ~$620 |
| Case Size | 42.5mm | 39.5mm |
| Movement | Automatic Caliber 4R34 (True GMT) | Automatic Caliber 6R35 |
| Caliber Type | Seiko In-House Automatic GMT | In-House Automatic Manufacture |
| Power Reserve | 41 Hours | 70 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) |
| Crystal | Hardlex Crystal | Sapphire with Cyclops |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Seiko's approach
Movement & Performance
Automatic Caliber 4R34 (True GMT) vs Automatic Caliber 6R35
Wearability & Fit
42.5mm vs 39.5mm — different wrist presence
Value & Cost of Ownership
Seiko is $125 more affordable
Water Resistance
100m (10 ATM) vs 200m (20 ATM)
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 ~$495, it delivers Automatic Caliber 4R34 (True GMT) with 41 Hours power reserve.
Check Price on AmazonSeiko
Prospex Alpinist
Choose the Seiko Prospex Alpinist if you value In-House Automatic Manufacture technology, Made in Japan heritage, and 39.5mm proportions. At ~$620, the Automatic Caliber 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 Alpinist represent two distinct approaches to fine watchmaking — the Seiko bringing Made in Japan tradition while Seiko delivers Made in Japan engineering.