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Casio F-91W vs Casio MRW-230H
Two timepieces compared — Under $50 vs Under $50
Quick Verdict
The Casio F-91W (Under $50) and Casio MRW-230H (Under $50) are closely matched timepieces at similar price points. The F-91W emphasizes Casio Digital Quartz (Battery) engineering while the MRW-230H focuses on Casio (Japan) craftsmanship.
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Specifications Compared
| Feature | Casio F-91W | Casio MRW-230H |
|---|---|---|
| Price | Under $50 | Under $50 |
| Case Size | 35mm | 44.6mm (47.9 x 44.6 x 12.3mm) |
| Movement | Quartz Module 593 | Quartz |
| Caliber Type | Casio Digital Quartz (Battery) | Casio Quartz (Battery) |
| Power Reserve | 7-Year Battery | Approx. 3-year battery (SR626SW) |
| Water Resistance | 30m (Splash Resistant) | 100m (10 ATM) |
| Crystal | Acrylic | Resin Glass |
| Case Material | Resin | Resin case, aluminum bezel ring |
| Origin | Casio (Japan) | Casio (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Casio's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Casio MRW-230H offers Resin case, aluminum bezel ring construction at 44.6mm (47.9 x 44.6 x 12.3mm) with Resin Glass. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Quartz
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The MRW-230H uses the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) reserve) at standard. The MRW-230H offers a longer power reserve.
Wearability & Fit
35mm vs 44.6mm (47.9 x 44.6 x 12.3mm) — different wrist presence
At 35mm, the F-91W wears more compactly on smaller wrists compared to the MRW-230H at 44.6mm (47.9 x 44.6 x 12.3mm). Water resistance differs: 30m (Splash Resistant) vs 100m (10 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Casio F-91W sits at Under $50 and the Casio MRW-230H at Under $50. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Resin Glass and Approx. 3-year battery (SR626SW) on the MRW-230H. Service intervals are typically 5-7 years for both.
Water Resistance
30m (Splash Resistant) vs 100m (10 ATM)
The F-91W is rated to 30m (Splash Resistant) while the MRW-230H handles 100m (10 ATM). The MRW-230H offers superior water resistance.
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 Under $50, it delivers Quartz Module 593 with 7-Year Battery power reserve.
Check Price on AmazonCasio
MRW-230H
Choose the Casio MRW-230H if you value Casio Quartz (Battery) technology, Casio (Japan) heritage, and 44.6mm (47.9 x 44.6 x 12.3mm) proportions. At Under $50, the Quartz with Approx. 3-year battery (SR626SW) power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Casio MRW-230H represent two distinct approaches to the timepiece category — the Casio bringing Casio (Japan) tradition while Casio delivers Casio (Japan) engineering.
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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.