Seiko Presage SSA425 Open Heart vs Rado True Square Automatic
Two timepieces compared — $250–$500 vs $1,500–$2,500
Quick Verdict
The Seiko Presage SSA425 Open Heart ($250–$500) offers Seiko In-House Automatic precision in the tier below the Rado True Square Automatic ($1,500–$2,500). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The True Square Automatic counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional timepieces for their respective tiers.
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Specifications Compared
| Feature | Seiko Presage SSA425 Open Heart | Rado True Square Automatic |
|---|---|---|
| Price | $250–$500 | $1,500–$2,500 |
| Case Size | 40.5mm | 38mm (Square) |
| Movement | Automatic Caliber 4R38 | Automatic ETA C07.611 |
| Caliber Type | Seiko In-House Automatic | Powermatic 80 (ETA-Based) |
| Power Reserve | 41 Hours | 80 Hours |
| Water Resistance | 50m (5 ATM) | 50m (5 ATM) |
| Crystal | Hardlex Crystal | Sapphire (Anti-Reflective) |
| Case Material | Stainless Steel | Monobloc High-Tech Ceramic |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Rado's approach
The Seiko Presage SSA425 Open Heart features a Stainless Steel case at 40.5mm with Hardlex Crystal protection. The Rado True Square Automatic offers Monobloc High-Tech Ceramic construction at 38mm (Square) with Sapphire (Anti-Reflective). Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R38 vs Automatic ETA C07.611
The Presage SSA425 Open Heart runs the Automatic Caliber 4R38 (Seiko In-House Automatic, 41 Hours power reserve) at 21,600 vph (3 Hz) frequency. The True Square Automatic uses the Automatic ETA C07.611 (Powermatic 80 (ETA-Based), 80 Hours reserve) at 21,600 vph (3 Hz). The True Square Automatic offers a longer power reserve.
Wearability & Fit
40.5mm vs 38mm (Square) — different wrist presence
At 40.5mm, the Presage SSA425 Open Heart has a bolder wrist presence compared to the True Square Automatic at 38mm (Square). Water resistance differs: 50m (5 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Seiko Presage SSA425 Open Heart sits at $250–$500 and the Rado True Square Automatic at $1,500–$2,500. On the specs that outlast any price: the Presage SSA425 Open Heart uses Hardlex Crystal with 41 Hours, against Sapphire (Anti-Reflective) and 80 Hours on the True Square Automatic. Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 50m (5 ATM)
The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the True Square Automatic handles 50m (5 ATM). Both offer identical water resistance ratings.
Our Verdict
Seiko
Presage SSA425 Open Heart
Choose the Seiko Presage SSA425 Open Heart if you prioritize Seiko In-House Automatic engineering, Made in Japan craftsmanship, and 50m (5 ATM) water resistance. At $250–$500, it delivers Automatic Caliber 4R38 with 41 Hours power reserve.
Check Price on AmazonRado
True Square Automatic
Choose the Rado True Square Automatic if you value Powermatic 80 (ETA-Based) technology, Swiss Made heritage, and 38mm (Square) proportions. At $1,500–$2,500, the Automatic ETA C07.611 with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko Presage SSA425 Open Heart and Rado True Square Automatic represent two distinct approaches to the timepiece category — the Seiko bringing Made in Japan tradition while Rado delivers Swiss Made 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.