Updated
Seiko Presage SSA425 Open Heart vs Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap)
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 Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) ($10,000–$25,000). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional timepieces for their respective tiers.
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Ulysse Nardin
Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap)
$10,000–$25,000
Specifications Compared
| Feature | Seiko Presage SSA425 Open Heart | Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) |
|---|---|---|
| Price | $250–$500 | $10,000–$25,000 |
| Case Size | 40.5mm | 42mm |
| Movement | Automatic Caliber 4R38 | Hand-wound, Ulysse Nardin calibre UN-371, silicon escapement and balance spring, skeletonised |
| Caliber Type | Seiko In-House Automatic | UN-371, hand-wound |
| Power Reserve | 41 Hours | About 96 hours (4 days) |
| Water Resistance | 50m (5 ATM) | 50m (5 ATM) |
| Crystal | Hardlex Crystal | Sapphire Crystal |
| Case Material | Stainless Steel | Titanium, blue PVD bezel, sapphire caseback |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Seiko's design language vs Ulysse Nardin's approach
The Seiko Presage SSA425 Open Heart features a Stainless Steel case at 40.5mm with Hardlex Crystal protection. The Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) offers Titanium, blue PVD bezel, sapphire caseback construction at 42mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R38 vs Hand-wound, Ulysse Nardin calibre UN-371, silicon escapement and balance spring, skeletonised
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 Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) uses the Hand-wound, Ulysse Nardin calibre UN-371, silicon escapement and balance spring, skeletonised (UN-371, hand-wound, About 96 hours (4 days) reserve) at standard. The Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) offers a longer power reserve.
Wearability & Fit
40.5mm vs 42mm — different wrist presence
At 40.5mm, the Presage SSA425 Open Heart wears more compactly on smaller wrists compared to the Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) at 42mm. 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 Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) at $10,000–$25,000. On the specs that outlast any price: the Presage SSA425 Open Heart uses Hardlex Crystal with 41 Hours, against Sapphire Crystal and About 96 hours (4 days) on the Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap). 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 Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) 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 AmazonUlysse Nardin
Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap)
Choose the Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) if you value UN-371, hand-wound technology, Swiss Made heritage, and 42mm proportions. At $10,000–$25,000, the Hand-wound, Ulysse Nardin calibre UN-371, silicon escapement and balance spring, skeletonised with About 96 hours (4 days) power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko Presage SSA425 Open Heart and Ulysse Nardin Executive Skeleton X 3713-260-3/03 (titanium, blue bezel, blue rubber strap) represent two distinct approaches to the timepiece category — the Seiko bringing Made in Japan tradition while Ulysse Nardin 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.