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Seiko Prospex "Turtle" vs Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap)
Seiko's diver meets Tudor's chronograph
Quick Verdict
The Seiko Prospex "Turtle" ($500–$1,000) offers In-House Automatic Manufacture precision in the tier below the Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) ($5,000–$10,000). The Prospex "Turtle" measures 45mm and is rated 200m (20 ATM) Diver. The Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Tudor
Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap)
$5,000–$10,000
Specifications Compared
| Feature | Seiko Prospex "Turtle" | Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) |
|---|---|---|
| Price | $500–$1,000 | $5,000–$10,000 |
| Case Size | 45mm | 41mm |
| Movement | Automatic Caliber 4R36 | Automatic, Tudor manufacture calibre MT5602-1U, Master Chronometer (METAS) |
| Caliber Type | In-House Automatic Manufacture | MT5602-1U, Master Chronometer |
| Power Reserve | 41 Hours | About 70 hours |
| Water Resistance | 200m (20 ATM) Diver | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Sapphire Crystal |
| Case Material | Stainless Steel | Black ceramic, unidirectional bezel with black ceramic insert, steel caseback with sapphire window |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Tudor's approach
The Seiko Prospex "Turtle" features a Stainless Steel case at 45mm with Sapphire Crystal protection. The Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) offers Black ceramic, unidirectional bezel with black ceramic insert, steel caseback with sapphire window construction at 41mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R36 vs Automatic, Tudor manufacture calibre MT5602-1U, Master Chronometer (METAS)
The Prospex "Turtle" runs the Automatic Caliber 4R36 (In-House Automatic Manufacture, 41 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) uses the Automatic, Tudor manufacture calibre MT5602-1U, Master Chronometer (METAS) (MT5602-1U, Master Chronometer, About 70 hours reserve) at standard. The Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) offers a longer power reserve.
Wearability & Fit
45mm vs 41mm — different wrist presence
At 45mm, the Prospex "Turtle" has a bolder wrist presence compared to the Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) at 41mm. Water resistance differs: 200m (20 ATM) Diver vs 200m (20 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Seiko Prospex "Turtle" sits at $500–$1,000 and the Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) at $5,000–$10,000. On the specs that outlast any price: the Prospex "Turtle" uses Sapphire Crystal with 41 Hours, against Sapphire Crystal and About 70 hours on the Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap). Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) Diver vs 200m (20 ATM)
The Prospex "Turtle" is rated to 200m (20 ATM) Diver while the Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) handles 200m (20 ATM). Both offer identical water resistance ratings.
Our Verdict
Seiko
Prospex "Turtle"
Choose the Seiko Prospex "Turtle" if you prioritize In-House Automatic Manufacture engineering, Made in Japan craftsmanship, and 200m (20 ATM) Diver water resistance. At $500–$1,000, it delivers Automatic Caliber 4R36 with 41 Hours power reserve.
Check Price on AmazonTudor
Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap)
Choose the Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) if you value MT5602-1U, Master Chronometer technology, Swiss Made heritage, and 41mm proportions. At $5,000–$10,000, the Automatic, Tudor manufacture calibre MT5602-1U, Master Chronometer (METAS) with About 70 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko Prospex "Turtle" and Tudor Black Bay Ceramic M79210CNU-0001 (black ceramic, black dial, hybrid strap) represent two distinct approaches to fine watchmaking — the Seiko 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.