Casio F-91W vs Hamilton Khaki Field Mechanical 38mm
Casio's timepiece meets Hamilton's field watch
Quick Verdict
The Casio F-91W (Under $50) offers Casio Digital Quartz (Battery) precision in the tier below the Hamilton Khaki Field Mechanical 38mm ($500–$1,000). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Khaki Field Mechanical 38mm counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Casio F-91W | Hamilton Khaki Field Mechanical 38mm |
|---|---|---|
| Price | Under $50 | $500–$1,000 |
| Case Size | 35mm | 38mm |
| Movement | Quartz Module 593 | Hand-Wound H-50 (ETA 2801-2 base) |
| Caliber Type | Casio Digital Quartz (Battery) | Hamilton/ETA Hand-Wound |
| Power Reserve | 7-Year Battery | 80 Hours |
| Water Resistance | 30m (Splash Resistant) | 50m (5 ATM) |
| Crystal | Acrylic | Sapphire Crystal |
| Case Material | Resin | Stainless Steel |
| Origin | Casio (Japan) | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Hamilton's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Hamilton Khaki Field Mechanical 38mm offers Stainless Steel construction at 38mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Hand-Wound H-50 (ETA 2801-2 base)
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Khaki Field Mechanical 38mm uses the Hand-Wound H-50 (ETA 2801-2 base) (Hamilton/ETA Hand-Wound, 80 Hours reserve) at 21,600 vph (3 Hz). The Khaki Field Mechanical 38mm offers a longer power reserve.
Wearability & Fit
35mm vs 38mm — different wrist presence
At 35mm, the F-91W wears more compactly on smaller wrists compared to the Khaki Field Mechanical 38mm at 38mm. Water resistance differs: 30m (Splash Resistant) vs 50m (5 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio F-91W sits at Under $50 and the Hamilton Khaki Field Mechanical 38mm at $500–$1,000. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Sapphire Crystal and 80 Hours on the Khaki Field Mechanical 38mm. Service intervals are typically 5-7 years for both.
Water Resistance
30m (Splash Resistant) vs 50m (5 ATM)
The F-91W is rated to 30m (Splash Resistant) while the Khaki Field Mechanical 38mm handles 50m (5 ATM). The Khaki Field Mechanical 38mm 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 AmazonHamilton
Khaki Field Mechanical 38mm
Choose the Hamilton Khaki Field Mechanical 38mm if you value Hamilton/ETA Hand-Wound technology, Swiss Made heritage, and 38mm proportions. At $500–$1,000, the Hand-Wound H-50 (ETA 2801-2 base) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Hamilton Khaki Field Mechanical 38mm represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Hamilton delivers Swiss Made engineering.
Frequently Asked Questions
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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.