Mido Ocean Star GMT vs Seiko Presage SSA425 Open Heart
Mido's diver meets Seiko's timepiece
Quick Verdict
The Seiko Presage SSA425 Open Heart (~$460) delivers Seiko In-House Automatic technology at $950 less than the Mido Ocean Star GMT (~$1,410). The Ocean Star GMT justifies its premium with Swiss Made heritage and Automatic Caliber 80 (Base ETA C07.661). Both represent excellent choices in the luxury watch category.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Mido Ocean Star GMT | Seiko Presage SSA425 Open Heart |
|---|---|---|
| Price | ~$1,410 | ~$460 |
| Case Size | 44mm | 40.5mm |
| Movement | Automatic Caliber 80 (Base ETA C07.661) | Automatic Caliber 4R38 |
| Caliber Type | Automatic (ETA C07.661 base) | Seiko In-House Automatic |
| Power Reserve | 80 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 50m (5 ATM) |
| Crystal | Sapphire with Double-sided AR | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Mido's design language vs Seiko's approach
Movement & Performance
Automatic Caliber 80 (Base ETA C07.661) vs Automatic Caliber 4R38
Wearability & Fit
44mm vs 40.5mm — different wrist presence
Value & Cost of Ownership
Seiko is $950 more affordable
Water Resistance
200m (20 ATM) vs 50m (5 ATM)
Our Verdict
Mido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you prioritize Automatic (ETA C07.661 base) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At ~$1,410, it delivers Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve.
Check Price on AmazonSeiko
Presage SSA425 Open Heart
Choose the Seiko Presage SSA425 Open Heart if you value Seiko In-House Automatic technology, Made in Japan heritage, and 40.5mm proportions. At ~$460, the Automatic Caliber 4R38 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Mido Ocean Star GMT and Seiko Presage SSA425 Open Heart represent two distinct approaches to fine watchmaking — the Mido bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.