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Casio Duro MDV106 Black vs Casio F-91W
Casio's diver meets Casio's timepiece
Quick Verdict
The Casio Duro MDV106 Black ($50–$100) and Casio F-91W (Under $50) are closely matched timepieces at similar price points. The Duro MDV106 Black emphasizes Casio Quartz (Battery) engineering while the F-91W focuses on Casio (Japan) craftsmanship.
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Specifications Compared
| Feature | Casio Duro MDV106 Black | Casio F-91W |
|---|---|---|
| Price | $50–$100 | Under $50 |
| Case Size | 44mm | 35mm |
| Movement | Quartz Module 2784 | Quartz Module 593 |
| Caliber Type | Casio Quartz (Battery) | Casio Digital Quartz (Battery) |
| Power Reserve | 3-Year Battery | 7-Year Battery |
| Water Resistance | 200m (20 ATM) Diver | 30m (Splash Resistant) |
| Crystal | Mineral Glass | Acrylic |
| Case Material | Stainless Steel | Resin |
| Origin | Casio (Japan) | Casio (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Casio's approach
The Casio Duro MDV106 Black features a Stainless Steel case at 44mm with Mineral Glass protection. The Casio F-91W offers Resin construction at 35mm with Acrylic. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 2784 vs Quartz Module 593
The Duro MDV106 Black runs the Quartz Module 2784 (Casio Quartz (Battery), 3-Year Battery power reserve) at standard frequency. The F-91W uses the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery reserve) at standard. The F-91W offers a longer power reserve.
Wearability & Fit
44mm vs 35mm — different wrist presence
At 44mm, the Duro MDV106 Black has a bolder wrist presence compared to the F-91W at 35mm. Water resistance differs: 200m (20 ATM) Diver vs 30m (Splash Resistant).
Value & Cost of Ownership
Same tier — different value propositions
The Casio Duro MDV106 Black sits at $50–$100 and the Casio F-91W at Under $50. On the specs that outlast any price: the Duro MDV106 Black uses Mineral Glass with 3-Year Battery, against Acrylic and 7-Year Battery on the F-91W. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) Diver vs 30m (Splash Resistant)
The Duro MDV106 Black is rated to 200m (20 ATM) Diver while the F-91W handles 30m (Splash Resistant). The Duro MDV106 Black is better suited for water activities.
Our Verdict
Casio
Duro MDV106 Black
Choose the Casio Duro MDV106 Black if you prioritize Casio Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 200m (20 ATM) Diver water resistance. At $50–$100, it delivers Quartz Module 2784 with 3-Year Battery power reserve.
Check Price on AmazonCasio
F-91W
Choose the Casio F-91W if you value Casio Digital Quartz (Battery) technology, Casio (Japan) heritage, and 35mm proportions. At Under $50, the Quartz Module 593 with 7-Year Battery power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Duro MDV106 Black and Casio F-91W represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Casio delivers Casio (Japan) 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.