Rado True Square Automatic vs Seiko Prospex Samurai SRPL13
Rado's timepiece meets Seiko's diver
Quick Verdict
The Seiko Prospex Samurai SRPL13 ($500–$1,000) delivers Seiko In-House Automatic technology in the tier below the Rado True Square Automatic ($1,500–$2,500). The Prospex Samurai SRPL13 measures 41.7mm and is rated 200m (20 ATM). The True Square Automatic justifies its premium with Swiss Made heritage and Automatic ETA C07.611. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Rado True Square Automatic | Seiko Prospex Samurai SRPL13 |
|---|---|---|
| Price | $1,500–$2,500 | $500–$1,000 |
| Case Size | 38mm (Square) | 41.7mm |
| Movement | Automatic ETA C07.611 | Automatic Caliber 4R35 |
| Caliber Type | Powermatic 80 (ETA-Based) | Seiko In-House Automatic |
| Power Reserve | 80 Hours | 41 Hours |
| Water Resistance | 50m (5 ATM) | 200m (20 ATM) |
| Crystal | Sapphire (Anti-Reflective) | Hardlex Crystal |
| Case Material | Monobloc High-Tech Ceramic | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Rado's design language vs Seiko's approach
The Rado True Square Automatic features a Monobloc High-Tech Ceramic case at 38mm (Square) with Sapphire (Anti-Reflective) 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 ETA C07.611 vs Automatic Caliber 4R35
The True Square Automatic runs the Automatic ETA C07.611 (Powermatic 80 (ETA-Based), 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Prospex Samurai SRPL13 uses the Automatic Caliber 4R35 (Seiko In-House Automatic, 41 Hours reserve) at 21,600 vph (3 Hz). The True Square Automatic edges ahead on power reserve.
Wearability & Fit
38mm (Square) vs 41.7mm — different wrist presence
At 38mm (Square), the True Square Automatic wears more compactly on smaller wrists compared to the Prospex Samurai SRPL13 at 41.7mm. Water resistance differs: 50m (5 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Rado True Square Automatic sits at $1,500–$2,500 and the Seiko Prospex Samurai SRPL13 at $500–$1,000. On the specs that outlast any price: the True Square Automatic uses Sapphire (Anti-Reflective) with 80 Hours, against Hardlex Crystal and 41 Hours on the Prospex Samurai SRPL13. Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 200m (20 ATM)
The True Square Automatic is rated to 50m (5 ATM) while the Prospex Samurai SRPL13 handles 200m (20 ATM). The Prospex Samurai SRPL13 offers superior water resistance.
Our Verdict
Rado
True Square Automatic
Choose the Rado True Square Automatic if you prioritize Powermatic 80 (ETA-Based) engineering, Swiss Made craftsmanship, and 50m (5 ATM) water resistance. At $1,500–$2,500, it delivers Automatic ETA C07.611 with 80 Hours 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 Rado True Square Automatic and Seiko Prospex Samurai SRPL13 represent two distinct approaches to fine watchmaking — the Rado bringing Swiss Made tradition while Seiko delivers Made in Japan 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.