Updated
Seiko Presage SSA425 Open Heart vs Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box)
Two timepieces compared — $250–$500 vs $10,000–$25,000
Quick Verdict
The Seiko Presage SSA425 Open Heart ($250–$500) offers Seiko In-House Automatic precision in the tier below the Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) ($10,000–$25,000). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) counters with Swiss Made craftsmanship and 50m (5 ATM) per Rolex for the period water resistance. Both are exceptional timepieces for their respective tiers.
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Rolex
Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box)
$10,000–$25,000
Specifications Compared
| Feature | Seiko Presage SSA425 Open Heart | Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) |
|---|---|---|
| Price | $250–$500 | $10,000–$25,000 |
| Case Size | 40.5mm | 36mm |
| Movement | Automatic Caliber 4R38 | Automatic, Rolex calibre 1570 (non-quickset date) |
| Caliber Type | Seiko In-House Automatic | Rolex 1570, chronometer certified |
| Power Reserve | 41 Hours | About 48 hours |
| Water Resistance | 50m (5 ATM) | 50m (5 ATM) per Rolex for the period |
| Crystal | Hardlex Crystal | Acrylic, Cyclops |
| Case Material | Stainless Steel | Stainless steel, smooth domed bezel |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Rolex's approach
The Seiko Presage SSA425 Open Heart features a Stainless Steel case at 40.5mm with Hardlex Crystal protection. The Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) offers Stainless steel, smooth domed bezel construction at 36mm with Acrylic, Cyclops. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R38 vs Automatic, Rolex calibre 1570 (non-quickset date)
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 Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) uses the Automatic, Rolex calibre 1570 (non-quickset date) (Rolex 1570, chronometer certified, About 48 hours reserve) at standard. The Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) offers a longer power reserve.
Wearability & Fit
40.5mm vs 36mm — different wrist presence
At 40.5mm, the Presage SSA425 Open Heart has a bolder wrist presence compared to the Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) at 36mm. Water resistance differs: 50m (5 ATM) vs 50m (5 ATM) per Rolex for the period.
Value & Cost of Ownership
Seiko sits in the lower tier
The Seiko Presage SSA425 Open Heart sits at $250–$500 and the Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) at $10,000–$25,000. On the specs that outlast any price: the Presage SSA425 Open Heart uses Hardlex Crystal with 41 Hours, against Acrylic, Cyclops and About 48 hours on the Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box). Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 50m (5 ATM) per Rolex for the period
The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) handles 50m (5 ATM) per Rolex for the period. 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 AmazonRolex
Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box)
Choose the Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) if you value Rolex 1570, chronometer certified technology, Swiss Made heritage, and 36mm proportions. At $10,000–$25,000, the Automatic, Rolex calibre 1570 (non-quickset date) with About 48 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko Presage SSA425 Open Heart and Rolex Datejust 1600 (steel, smooth bezel, blue Buckley dial, about 1971, box) represent two distinct approaches to the timepiece category — the Seiko bringing Made in Japan tradition while Rolex 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.