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Seiko Prospex "Turtle" vs Tudor Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer)
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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) ($2,500–$5,000). The Prospex "Turtle" measures 45mm and is rated 200m (20 ATM) Diver. The Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer)
$2,500–$5,000
Specifications Compared
| Feature | Seiko Prospex "Turtle" | Tudor Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) |
|---|---|---|
| Price | $500–$1,000 | $2,500–$5,000 |
| Case Size | 45mm | 41mm, 13.6mm thick, 21mm lugs |
| Movement | Automatic Caliber 4R36 | Tudor manufacture calibre MT5602-U, automatic, COSC chronometer and METAS Master Chronometer, bidirectional rotor |
| Caliber Type | In-House Automatic Manufacture | Tudor manufacture MT5602-U, COSC + METAS |
| Power Reserve | 41 Hours | About 70 hours |
| Water Resistance | 200m (20 ATM) Diver | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Domed sapphire |
| Case Material | Stainless Steel | Stainless steel, polished and satin; 60-minute unidirectional steel bezel with burgundy anodised aluminium insert; screw-down crown |
| 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) offers Stainless steel, polished and satin; 60-minute unidirectional steel bezel with burgundy anodised aluminium insert; screw-down crown construction at 41mm, 13.6mm thick, 21mm lugs with Domed sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R36 vs Tudor manufacture calibre MT5602-U, automatic, COSC chronometer and METAS Master Chronometer, bidirectional rotor
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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) uses the Tudor manufacture calibre MT5602-U, automatic, COSC chronometer and METAS Master Chronometer, bidirectional rotor (Tudor manufacture MT5602-U, COSC + METAS, About 70 hours reserve) at standard. The Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) offers a longer power reserve.
Wearability & Fit
45mm vs 41mm, 13.6mm thick, 21mm lugs — different wrist presence
At 45mm, the Prospex "Turtle" has a bolder wrist presence compared to the Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) at 41mm, 13.6mm thick, 21mm lugs. 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) at $2,500–$5,000. On the specs that outlast any price: the Prospex "Turtle" uses Sapphire Crystal with 41 Hours, against Domed sapphire and About 70 hours on the Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer). 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer)
Choose the Tudor Black Bay 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) if you value Tudor manufacture MT5602-U, COSC + METAS technology, Swiss Made heritage, and 41mm, 13.6mm thick, 21mm lugs proportions. At $2,500–$5,000, the Tudor manufacture calibre MT5602-U, automatic, COSC chronometer and METAS Master Chronometer, bidirectional rotor 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 41mm M7941A1A0RU-0001 (steel, burgundy bezel, black dial, steel bracelet, METAS Master Chronometer) 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
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