Rado True Square Automatic vs Seiko Prospex Samurai SRPF03
Rado's timepiece meets Seiko's diver
Quick Verdict
The Seiko Prospex Samurai SRPF03 ($250–$500) delivers Seiko Automatic, hand-winding and hacking technology in the tier below the Rado True Square Automatic ($1,500–$2,500). The Prospex Samurai SRPF03 measures 43.8mm 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.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Rado True Square Automatic | Seiko Prospex Samurai SRPF03 |
|---|---|---|
| Price | $1,500–$2,500 | $250–$500 |
| Case Size | 38mm (Square) | 43.8mm |
| Movement | Automatic ETA C07.611 | Automatic Caliber 4R35 |
| Caliber Type | Powermatic 80 (ETA-Based) | Seiko Automatic, hand-winding and hacking |
| 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 | Japanese Movement |
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 SRPF03 offers Stainless Steel construction at 43.8mm 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 SRPF03 uses the Automatic Caliber 4R35 (Seiko Automatic, hand-winding and hacking, 41 Hours reserve) at 21,600 vph (3 Hz). The True Square Automatic edges ahead on power reserve.
Wearability & Fit
38mm (Square) vs 43.8mm — different wrist presence
At 38mm (Square), the True Square Automatic wears more compactly on smaller wrists compared to the Prospex Samurai SRPF03 at 43.8mm. 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 SRPF03 at $250–$500. 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 SRPF03. 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 SRPF03 handles 200m (20 ATM). The Prospex Samurai SRPF03 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 SRPF03
Choose the Seiko Prospex Samurai SRPF03 if you value Seiko Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 43.8mm proportions. At $250–$500, 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 SRPF03 represent two distinct approaches to fine watchmaking — the Rado bringing Swiss Made tradition while Seiko delivers Japanese Movement engineering.
Frequently Asked Questions
More Comparisons
Tag Heuer Carrera Chronograph vs Rado True Square Automatic
Tag Heuer's chronograph meets Rado's timepiece
Tag Heuer Carrera Chronograph vs Seiko Prospex Samurai SRPF03
Tag Heuer's chronograph meets Seiko's diver
Tissot PRX Powermatic 80 vs Rado True Square Automatic
Two timepieces compared — $500–$1,000 vs $1,500–$2,500
Explore These Watches
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.