Casio F-91W vs Hamilton Khaki Field Automatic
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 Automatic ($500–$1,000). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Khaki Field Automatic counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Casio F-91W | Hamilton Khaki Field Automatic |
|---|---|---|
| Price | Under $50 | $500–$1,000 |
| Case Size | 35mm | 38mm |
| Movement | Quartz Module 593 | Automatic H-10 |
| Caliber Type | Casio Digital Quartz (Battery) | Automatic (ETA C07.611 base) |
| Power Reserve | 7-Year Battery | 80 Hours |
| Water Resistance | 30m (Splash Resistant) | 100m (10 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 Automatic 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 Automatic H-10
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Khaki Field Automatic uses the Automatic H-10 (Automatic (ETA C07.611 base), 80 Hours reserve) at 21,600 vph (3 Hz). The Khaki Field Automatic 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 Automatic at 38mm. Water resistance differs: 30m (Splash Resistant) vs 100m (10 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio F-91W sits at Under $50 and the Hamilton Khaki Field Automatic 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 Automatic. 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 Khaki Field Automatic handles 100m (10 ATM). The Khaki Field Automatic 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 Automatic
Choose the Hamilton Khaki Field Automatic if you value Automatic (ETA C07.611 base) technology, Swiss Made heritage, and 38mm proportions. At $500–$1,000, the Automatic H-10 with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Hamilton Khaki Field Automatic 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.