Casio F-91W vs Seiko 5 Sports GMT SSK001
Casio's timepiece meets Seiko's GMT watch
Quick Verdict
The Casio F-91W (~$20) offers Casio Digital Quartz (Battery) precision at $475 less than the Seiko 5 Sports GMT SSK001 (~$495). The 5 Sports GMT SSK001 counters with Made in Japan craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective price points.
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Specifications Compared
| Feature | Casio F-91W | Seiko 5 Sports GMT SSK001 |
|---|---|---|
| Price | ~$20 | ~$495 |
| Case Size | 35mm | 42.5mm |
| Movement | Quartz Module 593 | Automatic Caliber 4R34 (True GMT) |
| Caliber Type | Casio Digital Quartz (Battery) | Seiko In-House Automatic GMT |
| Power Reserve | 7-Year Battery | 41 Hours |
| Water Resistance | 30m (Splash Resistant) | 100m (10 ATM) |
| Crystal | Acrylic | Hardlex Crystal |
| Case Material | Resin | Stainless Steel |
| Origin | Casio (Japan) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Seiko's approach
Movement & Performance
Quartz Module 593 vs Automatic Caliber 4R34 (True GMT)
Wearability & Fit
35mm vs 42.5mm — different wrist presence
Value & Cost of Ownership
Casio is $475 more affordable
Water Resistance
30m (Splash Resistant) vs 100m (10 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 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 ~$495, the Automatic Caliber 4R34 (True GMT) with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Seiko 5 Sports GMT SSK001 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
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