Casio F-91W vs Invicta Pro Diver Automatic
Casio's timepiece meets Invicta's diver
Quick Verdict
The Casio F-91W (Under $50) and Invicta Pro Diver Automatic ($50–$100) are closely matched timepieces at similar price points. The F-91W emphasizes Casio Digital Quartz (Battery) engineering while the Pro Diver Automatic focuses on Japanese Movement (Seiko NH35) craftsmanship.
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Specifications Compared
| Feature | Casio F-91W | Invicta Pro Diver Automatic |
|---|---|---|
| Price | Under $50 | $50–$100 |
| Case Size | 35mm | 40mm |
| Movement | Quartz Module 593 | Automatic Seiko NH35 |
| Caliber Type | Casio Digital Quartz (Battery) | Seiko NH35 Automatic (Hacking, Hand-Winding) |
| Power Reserve | 7-Year Battery | 41 Hours |
| Water Resistance | 30m (Splash Resistant) | 200m (20 ATM) |
| Crystal | Acrylic | Mineral Glass |
| Case Material | Resin | Stainless Steel |
| Origin | Casio (Japan) | Japanese Movement (Seiko NH35) |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Invicta's approach
The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Invicta Pro Diver Automatic offers Stainless Steel construction at 40mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 593 vs Automatic Seiko NH35
The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Pro Diver Automatic uses the Automatic Seiko NH35 (Seiko NH35 Automatic (Hacking, Hand-Winding), 41 Hours reserve) at 21,600 vph (3 Hz). The Pro Diver Automatic 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 Pro Diver Automatic at 40mm. Water resistance differs: 30m (Splash Resistant) vs 200m (20 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Casio F-91W sits at Under $50 and the Invicta Pro Diver Automatic at $50–$100. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Mineral Glass and 41 Hours on the Pro Diver Automatic. Service intervals are typically 5-7 years for both.
Water Resistance
30m (Splash Resistant) vs 200m (20 ATM)
The F-91W is rated to 30m (Splash Resistant) while the Pro Diver Automatic handles 200m (20 ATM). The Pro Diver 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 AmazonInvicta
Pro Diver Automatic
Choose the Invicta Pro Diver Automatic if you value Seiko NH35 Automatic (Hacking, Hand-Winding) technology, Japanese Movement (Seiko NH35) heritage, and 40mm proportions. At $50–$100, the Automatic Seiko NH35 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio F-91W and Invicta Pro Diver Automatic represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Invicta delivers Japanese Movement (Seiko NH35) 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.