Casio F-91W vs Longines Master Collection Moonphase
Casio's timepiece meets Longines's dress watch
Quick Verdict
The Casio F-91W (Under $50) offers Casio Digital Quartz (Battery) precision in the tier below the Longines Master Collection Moonphase ($2,500–$5,000). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Master Collection Moonphase counters with Swiss Made craftsmanship and 30m (3 ATM) water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Casio F-91W | Longines Master Collection Moonphase |
|---|---|---|
| Price | Under $50 | $2,500–$5,000 |
| Case Size | 35mm | 40mm |
| Movement | Quartz Module 593 | Automatic Caliber L899 |
| Caliber Type | Casio Digital Quartz (Battery) | Automatic (ETA A31.L91 base) |
| Power Reserve | 7-Year Battery | 72 Hours |
| Water Resistance | 30m (Splash Resistant) | 30m (3 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 Longines's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Longines Master Collection Moonphase offers Stainless Steel construction at 40mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Automatic Caliber L899
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Master Collection Moonphase uses the Automatic Caliber L899 (Automatic (ETA A31.L91 base), 72 Hours reserve) at 25,200 vph (3.5 Hz). The Master Collection Moonphase offers a longer power reserve.
Wearability & Fit
35mm vs 40mm — different wrist presence
At 35mm, the F-91W wears more compactly on smaller wrists compared to the Master Collection Moonphase at 40mm. Water resistance differs: 30m (Splash Resistant) vs 30m (3 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio F-91W sits at Under $50 and the Longines Master Collection Moonphase at $2,500–$5,000. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Sapphire Crystal and 72 Hours on the Master Collection Moonphase. Service intervals are typically 5-7 years for both.
Water Resistance
30m (Splash Resistant) vs 30m (3 ATM)
The F-91W is rated to 30m (Splash Resistant) while the Master Collection Moonphase handles 30m (3 ATM). Both offer identical water resistance ratings.
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 AmazonLongines
Master Collection Moonphase
Choose the Longines Master Collection Moonphase if you value Automatic (ETA A31.L91 base) technology, Swiss Made heritage, and 40mm proportions. At $2,500–$5,000, the Automatic Caliber L899 with 72 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Longines Master Collection Moonphase represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Longines delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Frederique Constant Slimline Moonphase vs Longines Master Moonphase
Two moonphase dress watches under $5,000
Tag Heuer Carrera Chronograph vs Casio F-91W
Tag Heuer's chronograph meets Casio's timepiece
Tag Heuer Carrera Chronograph vs Longines Master Collection Moonphase
Tag Heuer's chronograph meets Longines's dress watch
Explore These Watches
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.