Tudor Black Bay 58 vs Seiko Prospex "Turtle"
Two divers compared — ~$4,480 vs ~$500
Quick Verdict
The Seiko Prospex "Turtle" (~$500) delivers In-House Automatic Manufacture technology at $3,980 less than the Tudor Black Bay 58 (~$4,480). 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 | Seiko Prospex "Turtle" |
|---|---|---|
| Price | ~$4,480 | ~$500 |
| Case Size | 39mm | 45mm |
| Movement | Automatic Manufacture Calibre MT5402 | Automatic Caliber 4R36 |
| Caliber Type | In-House Automatic Manufacture (Kenissi) | In-House Automatic Manufacture |
| Power Reserve | 70 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) Diver |
| 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 Seiko's approach
Movement & Performance
Automatic Manufacture Calibre MT5402 vs Automatic Caliber 4R36
Wearability & Fit
39mm vs 45mm — different wrist presence
Value & Cost of Ownership
Seiko is $3,980 more affordable
Water Resistance
200m (20 ATM) vs 200m (20 ATM) Diver
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 ~$4,480, it delivers Automatic Manufacture Calibre MT5402 with 70 Hours power reserve.
Check Price on AmazonSeiko
Prospex "Turtle"
Choose the Seiko Prospex "Turtle" if you value In-House Automatic Manufacture technology, Made in Japan heritage, and 45mm proportions. At ~$500, the Automatic Caliber 4R36 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Tudor Black Bay 58 and Seiko Prospex "Turtle" represent two distinct approaches to the diver category — the Tudor bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.