Tudor Black Bay 58 vs Orient Kamasu Automatic Diver
Two divers compared — $2,500–$5,000 vs $250–$500
Quick Verdict
The Orient Kamasu Automatic Diver ($250–$500) delivers Orient In-House Automatic technology in the tier below the Tudor Black Bay 58 ($2,500–$5,000). The Kamasu Automatic Diver measures 41.8mm and is rated 200m (20 ATM). The Black Bay 58 justifies its premium with Swiss Made heritage and Automatic Manufacture Calibre MT5402. Both represent excellent choices in the diver category.
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Specifications Compared
| Feature | Tudor Black Bay 58 | Orient Kamasu Automatic Diver |
|---|---|---|
| Price | $2,500–$5,000 | $250–$500 |
| Case Size | 39mm | 41.8mm |
| Movement | Automatic Manufacture Calibre MT5402 | Automatic Caliber F6922 |
| Caliber Type | In-House Automatic Manufacture (Kenissi) | Orient In-House Automatic |
| Power Reserve | 70 Hours | 40 Hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) |
| Crystal | Domed Sapphire | Sapphire Crystal |
| Case Material | 316L Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Tudor's design language vs Orient's approach
The Tudor Black Bay 58 features a 316L Stainless Steel case at 39mm with Domed Sapphire 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 Manufacture Calibre MT5402 vs Automatic Caliber F6922
The Black Bay 58 runs the Automatic Manufacture Calibre MT5402 (In-House Automatic Manufacture (Kenissi), 70 Hours power reserve) at 28,800 vph (4 Hz) frequency. The Kamasu Automatic Diver uses the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Black Bay 58 edges ahead on power reserve.
Wearability & Fit
39mm vs 41.8mm — different wrist presence
At 39mm, the Black Bay 58 wears more compactly on smaller wrists compared to the Kamasu Automatic Diver at 41.8mm. Water resistance differs: 200m (20 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Orient sits in the lower tier
The Tudor Black Bay 58 sits at $2,500–$5,000 and the Orient Kamasu Automatic Diver at $250–$500. On the specs that outlast any price: the Black Bay 58 uses Domed Sapphire with 70 Hours, against Sapphire Crystal and 40 Hours on the Kamasu Automatic Diver. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 200m (20 ATM)
The Black Bay 58 is rated to 200m (20 ATM) while the Kamasu Automatic Diver handles 200m (20 ATM). Both offer identical water resistance ratings.
Our Verdict
Tudor
Black Bay 58
Choose the Tudor Black Bay 58 if you prioritize In-House Automatic Manufacture (Kenissi) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Manufacture Calibre MT5402 with 70 Hours 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 Tudor Black Bay 58 and Orient Kamasu Automatic Diver represent two distinct approaches to the diver category — the Tudor bringing Swiss Made 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.