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Seiko Presage SSA425 Open Heart vs Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial)
Seiko's timepiece meets Ulysse Nardin's diver
Quick Verdict
The Seiko Presage SSA425 Open Heart ($250–$500) offers Seiko In-House Automatic precision in the tier below the Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial) ($25,000+). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The GMT Perpetual 326-60/62 (18k rose gold, black dial) counters with Swiss Made craftsmanship and Not stated in the Amazon rows; Ulysse Nardin lists the 326 case at 100m water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Seiko Presage SSA425 Open Heart | Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial) |
|---|---|---|
| Price | $250–$500 | $25,000+ |
| Case Size | 40.5mm | 42mm |
| Movement | Automatic Caliber 4R38 | Automatic, Ulysse Nardin calibre UN-32, perpetual calendar adjustable forwards and backwards via the crown |
| Caliber Type | Seiko In-House Automatic | UN-32, COSC chronometer |
| Power Reserve | 41 Hours | About 42 hours per Ulysse Nardin for the UN-32 |
| Water Resistance | 50m (5 ATM) | Not stated in the Amazon rows; Ulysse Nardin lists the 326 case at 100m |
| Crystal | Hardlex Crystal | Sapphire Crystal |
| Case Material | Stainless Steel | 18k rose gold |
| 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 GMT Perpetual 326-60/62 (18k rose gold, black dial) offers 18k rose gold construction at 42mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber 4R38 vs Automatic, Ulysse Nardin calibre UN-32, perpetual calendar adjustable forwards and backwards via the crown
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 GMT Perpetual 326-60/62 (18k rose gold, black dial) uses the Automatic, Ulysse Nardin calibre UN-32, perpetual calendar adjustable forwards and backwards via the crown (UN-32, COSC chronometer, About 42 hours per Ulysse Nardin for the UN-32 reserve) at standard. The GMT Perpetual 326-60/62 (18k rose gold, black dial) 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 GMT Perpetual 326-60/62 (18k rose gold, black dial) at 42mm. Water resistance differs: 50m (5 ATM) vs Not stated in the Amazon rows; Ulysse Nardin lists the 326 case at 100m.
Value & Cost of Ownership
Seiko sits in the lower tier
The Seiko Presage SSA425 Open Heart sits at $250–$500 and the Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial) at $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 42 hours per Ulysse Nardin for the UN-32 on the GMT Perpetual 326-60/62 (18k rose gold, black dial). Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs Not stated in the Amazon rows; Ulysse Nardin lists the 326 case at 100m
The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the GMT Perpetual 326-60/62 (18k rose gold, black dial) handles Not stated in the Amazon rows; Ulysse Nardin lists the 326 case at 100m. The GMT Perpetual 326-60/62 (18k rose gold, black dial) offers superior water resistance.
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
GMT Perpetual 326-60/62 (18k rose gold, black dial)
Choose the Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial) if you value UN-32, COSC chronometer technology, Swiss Made heritage, and 42mm proportions. At $25,000+, the Automatic, Ulysse Nardin calibre UN-32, perpetual calendar adjustable forwards and backwards via the crown with About 42 hours per Ulysse Nardin for the UN-32 power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Seiko Presage SSA425 Open Heart and Ulysse Nardin GMT Perpetual 326-60/62 (18k rose gold, black dial) represent two distinct approaches to fine watchmaking — 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.