Casio F-91W vs Mido Ocean Star GMT
Casio's timepiece meets Mido's diver
Quick Verdict
The Casio F-91W (~$20) offers Casio Digital Quartz (Battery) precision at $1,390 less than the Mido Ocean Star GMT (~$1,410). The Ocean Star GMT counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective price points.
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Specifications Compared
| Feature | Casio F-91W | Mido Ocean Star GMT |
|---|---|---|
| Price | ~$20 | ~$1,410 |
| Case Size | 35mm | 44mm |
| Movement | Quartz Module 593 | Automatic Caliber 80 (Base ETA C07.661) |
| Caliber Type | Casio Digital Quartz (Battery) | Automatic (ETA C07.661 base) |
| Power Reserve | 7-Year Battery | 80 Hours |
| Water Resistance | 30m (Splash Resistant) | 200m (20 ATM) |
| Crystal | Acrylic | Sapphire with Double-sided AR |
| Case Material | Resin | Stainless Steel |
| Origin | Casio (Japan) | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Mido's approach
Movement & Performance
Quartz Module 593 vs Automatic Caliber 80 (Base ETA C07.661)
Wearability & Fit
35mm vs 44mm — different wrist presence
Value & Cost of Ownership
Casio is $1,390 more affordable
Water Resistance
30m (Splash Resistant) vs 200m (20 ATM)
Our Verdict
Casio
F-91W
Choose the Casio F-91W if you prioritize Casio Digital Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 30m (Splash Resistant) water resistance. At ~$20, it delivers Quartz Module 593 with 7-Year Battery power reserve.
Check Price on AmazonMido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you value Automatic (ETA C07.661 base) technology, Swiss Made heritage, and 44mm proportions. At ~$1,410, the Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Mido Ocean Star GMT represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Mido delivers Swiss Made engineering.
Frequently Asked Questions
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