Updated
Orient Kamasu Automatic Diver vs Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet)
Two divers compared — $250–$500 vs $2,500–$5,000
Quick Verdict
The Orient Kamasu Automatic Diver ($250–$500) offers Orient In-House Automatic precision in the tier below the Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) ($2,500–$5,000). The Kamasu Automatic Diver measures 41.8mm and is rated 200m (20 ATM). The Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional divers for their respective tiers.
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Tudor
Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet)
$2,500–$5,000
Specifications Compared
| Feature | Orient Kamasu Automatic Diver | Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) |
|---|---|---|
| Price | $250–$500 | $2,500–$5,000 |
| Case Size | 41.8mm | 39mm, 11.9mm thick, 20mm lugs |
| Movement | Automatic Caliber F6922 | Tudor manufacture calibre MT5402, automatic, COSC chronometer, bidirectional rotor |
| Caliber Type | Orient In-House Automatic | Tudor manufacture MT5402, COSC |
| Power Reserve | 40 Hours | About 70 hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Domed sapphire |
| Case Material | Stainless Steel | Stainless steel, polished and satin; unidirectional bezel with navy blue anodised aluminium insert; screw-down crown |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Orient's design language vs Tudor's approach
The Orient Kamasu Automatic Diver features a Stainless Steel case at 41.8mm with Sapphire Crystal protection. The Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) offers Stainless steel, polished and satin; unidirectional bezel with navy blue anodised aluminium insert; screw-down crown construction at 39mm, 11.9mm thick, 20mm lugs with Domed sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber F6922 vs Tudor manufacture calibre MT5402, automatic, COSC chronometer, bidirectional rotor
The Kamasu Automatic Diver runs the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) uses the Tudor manufacture calibre MT5402, automatic, COSC chronometer, bidirectional rotor (Tudor manufacture MT5402, COSC, About 70 hours reserve) at standard. The Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) offers a longer power reserve.
Wearability & Fit
41.8mm vs 39mm, 11.9mm thick, 20mm lugs — different wrist presence
At 41.8mm, the Kamasu Automatic Diver has a bolder wrist presence compared to the Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) at 39mm, 11.9mm thick, 20mm lugs. Water resistance differs: 200m (20 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Orient sits in the lower tier
The Orient Kamasu Automatic Diver sits at $250–$500 and the Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) at $2,500–$5,000. On the specs that outlast any price: the Kamasu Automatic Diver uses Sapphire Crystal with 40 Hours, against Domed sapphire and About 70 hours on the Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet). Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 200m (20 ATM)
The Kamasu Automatic Diver is rated to 200m (20 ATM) while the Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) handles 200m (20 ATM). Both offer identical water resistance ratings.
Our Verdict
Orient
Kamasu Automatic Diver
Choose the Orient Kamasu Automatic Diver if you prioritize Orient In-House Automatic engineering, Made in Japan craftsmanship, and 200m (20 ATM) water resistance. At $250–$500, it delivers Automatic Caliber F6922 with 40 Hours power reserve.
View the dossierTudor
Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet)
Choose the Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) if you value Tudor manufacture MT5402, COSC technology, Swiss Made heritage, and 39mm, 11.9mm thick, 20mm lugs proportions. At $2,500–$5,000, the Tudor manufacture calibre MT5402, automatic, COSC chronometer, bidirectional rotor with About 70 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Orient Kamasu Automatic Diver and Tudor Black Bay Fifty-Eight 39mm M79030B-0001 (steel, navy blue bezel and dial, riveted steel bracelet) represent two distinct approaches to the diver category — the Orient bringing Made in Japan tradition while Tudor delivers Swiss Made 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.