Bulova Classic Automatic 98A139 vs Orient Kamasu Automatic Diver
Bulova's timepiece meets Orient's diver
Quick Verdict
The Bulova Classic Automatic 98A139 ($250–$500) and Orient Kamasu Automatic Diver ($250–$500) are closely matched timepieces at similar price points. The Classic Automatic 98A139 emphasizes Self-Winding Automatic engineering while the Kamasu Automatic Diver focuses on Made in Japan craftsmanship.
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Specifications Compared
| Feature | Bulova Classic Automatic 98A139 | Orient Kamasu Automatic Diver |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 45mm | 41.8mm |
| Movement | Automatic, 21 Jewels | Automatic Caliber F6922 |
| Caliber Type | Self-Winding Automatic | Orient In-House Automatic |
| Power Reserve | — | 40 Hours |
| Water Resistance | 30m (3 ATM) | 200m (20 ATM) |
| Crystal | Domed Crystal | Sapphire Crystal |
| Case Material | Black Ion-Plated Stainless Steel | Stainless Steel |
| Origin | Japanese Movement | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Bulova's design language vs Orient's approach
The Bulova Classic Automatic 98A139 features a Black Ion-Plated Stainless Steel case at 45mm with Domed Crystal protection. The Orient Kamasu Automatic Diver offers Stainless Steel construction at 41.8mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, 21 Jewels vs Automatic Caliber F6922
The Classic Automatic 98A139 runs the Automatic, 21 Jewels (Self-Winding Automatic, standard power reserve) at standard frequency. The Kamasu Automatic Diver uses the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Kamasu Automatic Diver offers a longer power reserve.
Wearability & Fit
45mm vs 41.8mm — different wrist presence
At 45mm, the Classic Automatic 98A139 has a bolder wrist presence compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 30m (3 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Bulova Classic Automatic 98A139 sits at $250–$500 and the Orient Kamasu Automatic Diver at $250–$500. On the specs that outlast any price: the Classic Automatic 98A139 uses Domed Crystal with a standard reserve, against Sapphire Crystal and 40 Hours on the Kamasu Automatic Diver. Service intervals are typically 5-7 years for both.
Water Resistance
30m (3 ATM) vs 200m (20 ATM)
The Classic Automatic 98A139 is rated to 30m (3 ATM) while the Kamasu Automatic Diver handles 200m (20 ATM). The Kamasu Automatic Diver offers superior water resistance.
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 AmazonOrient
Kamasu Automatic Diver
Choose the Orient Kamasu Automatic Diver if you value Orient In-House Automatic technology, Made in Japan heritage, and 41.8mm proportions. At $250–$500, the Automatic Caliber F6922 with 40 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Bulova Classic Automatic 98A139 and Orient Kamasu Automatic Diver represent two distinct approaches to fine watchmaking — the Bulova bringing Japanese Movement tradition while Orient delivers Made in 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.