Updated
Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) vs Seiko Prospex Samurai SRPL13
Two divers compared — $10,000–$25,000 vs $500–$1,000
Quick Verdict
The Seiko Prospex Samurai SRPL13 ($500–$1,000) delivers Seiko In-House Automatic technology in the tier below the Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) ($10,000–$25,000). The Prospex Samurai SRPL13 measures 41.7mm and is rated 200m (20 ATM). The Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) justifies its premium with Swiss Made heritage and Automatic, Blancpain calibre 6654.P, silicon balance spring. Both represent excellent choices in the diver category.
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Blancpain
Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap)
$10,000–$25,000
Specifications Compared
| Feature | Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) | Seiko Prospex Samurai SRPL13 |
|---|---|---|
| Price | $10,000–$25,000 | $500–$1,000 |
| Case Size | 43mm | 41.7mm |
| Movement | Automatic, Blancpain calibre 6654.P, silicon balance spring | Automatic Caliber 4R35 |
| Caliber Type | 6654.P, automatic | Seiko In-House Automatic |
| Power Reserve | About 72 hours (3 days) | 41 Hours |
| Water Resistance | 300m (30 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Hardlex Crystal |
| Case Material | Stainless steel, grey ceramic unidirectional bezel with Liquidmetal markers, sapphire caseback | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Blancpain's design language vs Seiko's approach
The Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) features a Stainless steel, grey ceramic unidirectional bezel with Liquidmetal markers, sapphire caseback case at 43mm with Sapphire Crystal protection. The Seiko Prospex Samurai SRPL13 offers Stainless Steel construction at 41.7mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, Blancpain calibre 6654.P, silicon balance spring vs Automatic Caliber 4R35
The Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) runs the Automatic, Blancpain calibre 6654.P, silicon balance spring (6654.P, automatic, About 72 hours (3 days) power reserve) at standard frequency. The Prospex Samurai SRPL13 uses the Automatic Caliber 4R35 (Seiko In-House Automatic, 41 Hours reserve) at 21,600 vph (3 Hz). The Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) edges ahead on power reserve.
Wearability & Fit
43mm vs 41.7mm — different wrist presence
At 43mm, the Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) has a bolder wrist presence compared to the Prospex Samurai SRPL13 at 41.7mm. Water resistance differs: 300m (30 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) sits at $10,000–$25,000 and the Seiko Prospex Samurai SRPL13 at $500–$1,000. On the specs that outlast any price: the Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) uses Sapphire Crystal with About 72 hours (3 days), against Hardlex Crystal and 41 Hours on the Prospex Samurai SRPL13. Service intervals are typically 5-7 years for both.
Water Resistance
300m (30 ATM) vs 200m (20 ATM)
The Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) is rated to 300m (30 ATM) while the Prospex Samurai SRPL13 handles 200m (20 ATM). The Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) is better suited for water activities.
Our Verdict
Blancpain
Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap)
Choose the Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) if you prioritize 6654.P, automatic engineering, Swiss Made craftsmanship, and 300m (30 ATM) water resistance. At $10,000–$25,000, it delivers Automatic, Blancpain calibre 6654.P, silicon balance spring with About 72 hours (3 days) power reserve.
Check Price on AmazonSeiko
Prospex Samurai SRPL13
Choose the Seiko Prospex Samurai SRPL13 if you value Seiko In-House Automatic technology, Made in Japan heritage, and 41.7mm proportions. At $500–$1,000, the Automatic Caliber 4R35 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Blancpain Fifty Fathoms Bathyscaphe Quantieme Complet Phases de Lune 5054-1110-B52A (steel, grey dial, sail-canvas strap) and Seiko Prospex Samurai SRPL13 represent two distinct approaches to the diver category — the Blancpain bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
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How This Page Was Made
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