Bulova Classic Automatic 98A139 vs Casio F-91W
Two timepieces compared — $250–$500 vs Under $50
Quick Verdict
The Casio F-91W (Under $50) delivers Casio Digital Quartz (Battery) technology in the tier below the Bulova Classic Automatic 98A139 ($250–$500). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Classic Automatic 98A139 justifies its premium with Japanese Movement heritage and Automatic, 21 Jewels. Both represent excellent choices in the timepiece category.
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Specifications Compared
| Feature | Bulova Classic Automatic 98A139 | Casio F-91W |
|---|---|---|
| Price | $250–$500 | Under $50 |
| Case Size | 45mm | 35mm |
| Movement | Automatic, 21 Jewels | Quartz Module 593 |
| Caliber Type | Self-Winding Automatic | Casio Digital Quartz (Battery) |
| Power Reserve | — | 7-Year Battery |
| Water Resistance | 30m (3 ATM) | 30m (Splash Resistant) |
| Crystal | Domed Crystal | Acrylic |
| Case Material | Black Ion-Plated Stainless Steel | Resin |
| Origin | Japanese Movement | Casio (Japan) |
Category-by-Category Analysis
Design & Aesthetics
Bulova's design language vs Casio's approach
The Bulova Classic Automatic 98A139 features a Black Ion-Plated Stainless Steel case at 45mm with Domed Crystal protection. The Casio F-91W offers Resin construction at 35mm with Acrylic. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, 21 Jewels vs Quartz Module 593
The Classic Automatic 98A139 runs the Automatic, 21 Jewels (Self-Winding Automatic, standard 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
45mm vs 35mm — different wrist presence
At 45mm, the Classic Automatic 98A139 has a bolder wrist presence compared to the F-91W at 35mm. Water resistance differs: 30m (3 ATM) vs 30m (Splash Resistant).
Value & Cost of Ownership
Casio sits in the lower tier
The Bulova Classic Automatic 98A139 sits at $250–$500 and the Casio F-91W at Under $50. On the specs that outlast any price: the Classic Automatic 98A139 uses Domed Crystal with a standard reserve, against Acrylic and 7-Year Battery on the F-91W. Service intervals are typically 5-7 years for both.
Water Resistance
30m (3 ATM) vs 30m (Splash Resistant)
The Classic Automatic 98A139 is rated to 30m (3 ATM) while the F-91W handles 30m (Splash Resistant). Both offer identical water resistance ratings.
Our Verdict
Bulova
Classic Automatic 98A139
Choose the Bulova Classic Automatic 98A139 if you prioritize Self-Winding Automatic engineering, Japanese Movement craftsmanship, and 30m (3 ATM) water resistance. At $250–$500, it delivers Automatic, 21 Jewels with solid 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 Bulova Classic Automatic 98A139 and Casio F-91W represent two distinct approaches to the timepiece category — the Bulova bringing Japanese Movement 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.