Casio F-91W vs Frederique Constant Classic Quartz Moonphase
Casio's timepiece meets Frederique Constant's dress watch
Quick Verdict
The Casio F-91W (Under $50) offers Casio Digital Quartz (Battery) precision in the tier below the Frederique Constant Classic Quartz Moonphase ($1,000–$1,500). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Classic Quartz Moonphase 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 | Frederique Constant Classic Quartz Moonphase |
|---|---|---|
| Price | Under $50 | $1,000–$1,500 |
| Case Size | 35mm | 40mm |
| Movement | Quartz Module 593 | Quartz FC-206 |
| Caliber Type | Casio Digital Quartz (Battery) | Swiss Quartz |
| Power Reserve | 7-Year Battery | Battery |
| Water Resistance | 30m (Splash Resistant) | 50m (5 ATM) |
| Crystal | Acrylic | Anti-Reflective Sapphire Crystal |
| Case Material | Resin | Stainless Steel |
| Origin | Casio (Japan) | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Frederique Constant's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Frederique Constant Classic Quartz Moonphase offers Stainless Steel construction at 40mm with Anti-Reflective Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Quartz FC-206
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Classic Quartz Moonphase uses the Quartz FC-206 (Swiss Quartz, Battery reserve) at standard. The F-91W edges ahead on power reserve.
Wearability & Fit
35mm vs 40mm — different wrist presence
At 35mm, the F-91W wears more compactly on smaller wrists compared to the Classic Quartz Moonphase at 40mm. 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 Frederique Constant Classic Quartz Moonphase at $1,000–$1,500. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Anti-Reflective Sapphire Crystal and Battery on the Classic Quartz Moonphase. 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 Classic Quartz Moonphase handles 50m (5 ATM). The Classic Quartz Moonphase 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 AmazonFrederique Constant
Classic Quartz Moonphase
Choose the Frederique Constant Classic Quartz Moonphase if you value Swiss Quartz technology, Swiss Made heritage, and 40mm proportions. At $1,000–$1,500, the Quartz FC-206 with Battery power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Frederique Constant Classic Quartz Moonphase represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Frederique Constant 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.